diff --git a/package-lock.json b/package-lock.json
index fdc631602..ff7c19908 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,107 +5,49 @@
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-            "integrity": "sha512-pcnnhaoG6RtrvHJ1dFncAe8Od6Nuy30oaJ82ts6//sGSXOP5UjBMEthiProjXmMNHOfd93sqlkztifFMcb+4yw==",
+            "version": "3.7.1",
+            "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.7.1.tgz",
+            "integrity": "sha512-pnOF7jY82wdIhATVn87uUY/FHU+MDUdPLkmGFvGoclQmeu229eTkbG5gjGGBi3R7UuYYSEeYXY/TTY5j2aym2g==",
             "dev": true,
             "optional": true,
             "requires": {
@@ -5237,13 +4931,6 @@
                 "source-map": "~0.6.1"
             },
             "dependencies": {
-                "commander": {
-                    "version": "2.20.3",
-                    "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-                    "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-                    "dev": true,
-                    "optional": true
-                },
                 "source-map": {
                     "version": "0.6.1",
                     "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -5332,12 +5019,6 @@
             "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
             "dev": true
         },
-        "util-deprecate": {
-            "version": "1.0.2",
-            "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-            "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-            "dev": true
-        },
         "util.promisify": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
@@ -5349,9 +5030,9 @@
             }
         },
         "uuid": {
-            "version": "3.3.2",
-            "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-            "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+            "version": "3.3.3",
+            "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+            "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
             "dev": true
         },
         "validate-npm-package-license": {
@@ -5440,6 +5121,12 @@
             "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
             "dev": true
         },
+        "word-wrap": {
+            "version": "1.2.3",
+            "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+            "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+            "dev": true
+        },
         "wordwrap": {
             "version": "0.0.3",
             "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
@@ -5447,50 +5134,14 @@
             "dev": true
         },
         "wrap-ansi": {
-            "version": "2.1.0",
-            "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
-            "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+            "version": "5.1.0",
+            "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+            "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
             "dev": true,
             "requires": {
-                "string-width": "^1.0.1",
-                "strip-ansi": "^3.0.1"
-            },
-            "dependencies": {
-                "ansi-regex": {
-                    "version": "2.1.1",
-                    "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-                    "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-                    "dev": true
-                },
-                "is-fullwidth-code-point": {
-                    "version": "1.0.0",
-                    "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
-                    "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-                    "dev": true,
-                    "requires": {
-                        "number-is-nan": "^1.0.0"
-                    }
-                },
-                "string-width": {
-                    "version": "1.0.2",
-                    "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-                    "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-                    "dev": true,
-                    "requires": {
-                        "code-point-at": "^1.0.0",
-                        "is-fullwidth-code-point": "^1.0.0",
-                        "strip-ansi": "^3.0.0"
-                    }
-                },
-                "strip-ansi": {
-                    "version": "3.0.1",
-                    "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-                    "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-                    "dev": true,
-                    "requires": {
-                        "ansi-regex": "^2.0.0"
-                    }
-                }
+                "ansi-styles": "^3.2.0",
+                "string-width": "^3.0.0",
+                "strip-ansi": "^5.0.0"
             }
         },
         "wrappy": {
@@ -5532,29 +5183,27 @@
             "dev": true
         },
         "yargs": {
-            "version": "12.0.5",
-            "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-            "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+            "version": "13.3.0",
+            "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+            "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
             "dev": true,
             "requires": {
-                "cliui": "^4.0.0",
-                "decamelize": "^1.2.0",
+                "cliui": "^5.0.0",
                 "find-up": "^3.0.0",
-                "get-caller-file": "^1.0.1",
-                "os-locale": "^3.0.0",
+                "get-caller-file": "^2.0.1",
                 "require-directory": "^2.1.1",
-                "require-main-filename": "^1.0.1",
+                "require-main-filename": "^2.0.0",
                 "set-blocking": "^2.0.0",
-                "string-width": "^2.0.0",
+                "string-width": "^3.0.0",
                 "which-module": "^2.0.0",
-                "y18n": "^3.2.1 || ^4.0.0",
-                "yargs-parser": "^11.1.1"
+                "y18n": "^4.0.0",
+                "yargs-parser": "^13.1.1"
             }
         },
         "yargs-parser": {
-            "version": "11.1.1",
-            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-            "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+            "version": "13.1.1",
+            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+            "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
             "dev": true,
             "requires": {
                 "camelcase": "^5.0.0",
@@ -5562,9 +5211,9 @@
             }
         },
         "yn": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
-            "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+            "version": "3.1.1",
+            "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+            "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
             "dev": true
         }
     }
diff --git a/package.json b/package.json
index b7c1f469a..1f58ae98a 100644
--- a/package.json
+++ b/package.json
@@ -39,24 +39,24 @@
         "node": ">=8.5.0"
     },
     "dependencies": {
-        "resolve": "^1.11.0",
+        "resolve": "^1.13.1",
         "source-map": "^0.7.3",
-        "typescript": "^3.6.2"
+        "typescript": "^3.7.3"
     },
     "devDependencies": {
         "@types/fs-extra": "^8.0.1",
         "@types/glob": "^7.1.1",
-        "@types/jest": "^24.0.15",
-        "@types/node": "^11.13.14",
+        "@types/jest": "^24.0.23",
+        "@types/node": "^12.12.14",
         "@types/resolve": "0.0.8",
         "fengari": "^0.1.4",
         "fs-extra": "^8.1.0",
-        "javascript-stringify": "^2.0.0",
-        "jest": "^24.8.0",
-        "jest-circus": "^24.8.0",
-        "prettier": "^1.18.2",
-        "ts-jest": "^24.0.2",
-        "ts-node": "^7.0.1",
-        "tslint": "^5.17.0"
+        "javascript-stringify": "^2.0.1",
+        "jest": "^24.9.0",
+        "jest-circus": "^24.9.0",
+        "prettier": "^1.19.1",
+        "ts-jest": "^24.2.0",
+        "ts-node": "^8.5.4",
+        "tslint": "^5.20.1"
     }
 }
diff --git a/src/Emit.ts b/src/Emit.ts
index dd3208eb9..160ca49ff 100644
--- a/src/Emit.ts
+++ b/src/Emit.ts
@@ -19,7 +19,7 @@ export function emitTranspiledFiles(
     let { outDir, luaLibImport, luaBundle } = options;
 
     const rootDir = program.getCommonSourceDirectory();
-    outDir = outDir || rootDir;
+    outDir = outDir ?? rootDir;
 
     const files: OutputFile[] = [];
     for (const { fileName, lua, sourceMap, declaration, declarationMap } of transpiledFiles) {
@@ -54,7 +54,7 @@ export function emitTranspiledFiles(
             luaLibImport === LuaLibImportKind.Require ||
             luaLibImport === LuaLibImportKind.Always)
     ) {
-        const lualibRequired = files.some(f => f.text && f.text.includes(`require("lualib_bundle")`));
+        const lualibRequired = files.some(f => f.text?.includes(`require("lualib_bundle")`));
         if (lualibRequired) {
             if (lualibContent === undefined) {
                 const lualibBundle = emitHost.readFile(path.resolve(__dirname, "../dist/lualib/lualib_bundle.lua"));
diff --git a/src/LuaAST.ts b/src/LuaAST.ts
index 2ef2310dd..10c7b44b3 100644
--- a/src/LuaAST.ts
+++ b/src/LuaAST.ts
@@ -186,7 +186,7 @@ export function setParent(node: Node | Node[] | undefined, parent: Node): void {
 }
 
 function getSourcePosition(sourceNode: ts.Node): TextRange | undefined {
-    if (sourceNode !== undefined && sourceNode.getSourceFile() !== undefined && sourceNode.pos >= 0) {
+    if (sourceNode.getSourceFile() !== undefined && sourceNode.pos >= 0) {
         const { line, character } = ts.getLineAndCharacterOfPosition(
             sourceNode.getSourceFile(),
             sourceNode.pos + sourceNode.getLeadingTriviaWidth()
@@ -901,12 +901,7 @@ export type FunctionDefinition = (VariableDeclarationStatement | AssignmentState
 export function isFunctionDefinition(
     statement: VariableDeclarationStatement | AssignmentStatement
 ): statement is FunctionDefinition {
-    return (
-        statement.left.length === 1 &&
-        statement.right !== undefined &&
-        statement.right.length === 1 &&
-        isFunctionExpression(statement.right[0])
-    );
+    return statement.left.length === 1 && statement.right?.length === 1 && isFunctionExpression(statement.right[0]);
 }
 
 export type InlineFunctionExpression = FunctionExpression & {
@@ -915,8 +910,7 @@ export type InlineFunctionExpression = FunctionExpression & {
 
 export function isInlineFunctionExpression(expression: FunctionExpression): expression is InlineFunctionExpression {
     return (
-        expression.body.statements !== undefined &&
-        expression.body.statements.length === 1 &&
+        expression.body.statements?.length === 1 &&
         isReturnStatement(expression.body.statements[0]) &&
         (expression.body.statements[0] as ReturnStatement).expressions !== undefined &&
         (expression.flags & FunctionExpressionFlags.Inline) !== 0
diff --git a/src/LuaPrinter.ts b/src/LuaPrinter.ts
index 2d8a2ac20..38440698c 100644
--- a/src/LuaPrinter.ts
+++ b/src/LuaPrinter.ts
@@ -23,8 +23,7 @@ const escapeStringMap: Record<string, string> = {
     "\0": "\\0",
 };
 
-export const escapeString = (value: string) =>
-    `"${value.replace(escapeStringRegExp, char => escapeStringMap[char] || char)}"`;
+export const escapeString = (value: string) => `"${value.replace(escapeStringRegExp, char => escapeStringMap[char])}"`;
 
 /**
  * Checks that a name is valid for use in lua function declaration syntax:
@@ -198,7 +197,7 @@ export class LuaPrinter {
             header += `--[[ Generated with https://github.com/TypeScriptToLua/TypeScriptToLua ]]\n`;
         }
 
-        const luaLibImport = this.options.luaLibImport || LuaLibImportKind.Require;
+        const luaLibImport = this.options.luaLibImport ?? LuaLibImportKind.Require;
         if (
             luaLibImport === LuaLibImportKind.Always ||
             (luaLibImport === LuaLibImportKind.Require && luaLibFeatures.size > 0)
@@ -341,11 +340,21 @@ export class LuaPrinter {
             // Print all local functions as `local function foo()` instead of `local foo = function` to allow recursion
             chunks.push(this.printFunctionDefinition(statement));
         } else {
-            chunks.push(...this.joinChunks(", ", statement.left.map(e => this.printExpression(e))));
+            chunks.push(
+                ...this.joinChunks(
+                    ", ",
+                    statement.left.map(e => this.printExpression(e))
+                )
+            );
 
             if (statement.right) {
                 chunks.push(" = ");
-                chunks.push(...this.joinChunks(", ", statement.right.map(e => this.printExpression(e))));
+                chunks.push(
+                    ...this.joinChunks(
+                        ", ",
+                        statement.right.map(e => this.printExpression(e))
+                    )
+                );
             }
         }
 
@@ -369,9 +378,19 @@ export class LuaPrinter {
             }
         }
 
-        chunks.push(...this.joinChunks(", ", statement.left.map(e => this.printExpression(e))));
+        chunks.push(
+            ...this.joinChunks(
+                ", ",
+                statement.left.map(e => this.printExpression(e))
+            )
+        );
         chunks.push(" = ");
-        chunks.push(...this.joinChunks(", ", statement.right.map(e => this.printExpression(e))));
+        chunks.push(
+            ...this.joinChunks(
+                ", ",
+                statement.right.map(e => this.printExpression(e))
+            )
+        );
 
         return this.createSourceNode(statement, chunks);
     }
@@ -458,8 +477,14 @@ export class LuaPrinter {
     }
 
     public printForInStatement(statement: lua.ForInStatement): SourceNode {
-        const names = this.joinChunks(", ", statement.names.map(i => this.printIdentifier(i)));
-        const expressions = this.joinChunks(", ", statement.expressions.map(e => this.printExpression(e)));
+        const names = this.joinChunks(
+            ", ",
+            statement.names.map(i => this.printIdentifier(i))
+        );
+        const expressions = this.joinChunks(
+            ", ",
+            statement.expressions.map(e => this.printExpression(e))
+        );
 
         const chunks: SourceChunk[] = [];
 
@@ -488,7 +513,12 @@ export class LuaPrinter {
 
         const chunks: SourceChunk[] = [];
 
-        chunks.push(...this.joinChunks(", ", statement.expressions.map(e => this.printExpression(e))));
+        chunks.push(
+            ...this.joinChunks(
+                ", ",
+                statement.expressions.map(e => this.printExpression(e))
+            )
+        );
 
         return this.createSourceNode(statement, [this.indent(), "return ", ...chunks]);
     }
@@ -588,7 +618,10 @@ export class LuaPrinter {
             chunks.push(" ");
             const returnNode: SourceChunk[] = [
                 "return ",
-                ...this.joinChunks(", ", returnStatement.expressions.map(e => this.printExpression(e))),
+                ...this.joinChunks(
+                    ", ",
+                    returnStatement.expressions.map(e => this.printExpression(e))
+                ),
             ];
             chunks.push(this.createSourceNode(returnStatement, returnNode));
             chunks.push(this.createSourceNode(expression, " end"));
@@ -780,7 +813,12 @@ export class LuaPrinter {
         const chunks: SourceChunk[] = [];
 
         if (expressions.every(isSimpleExpression)) {
-            chunks.push(...this.joinChunks(", ", expressions.map(e => this.printExpression(e))));
+            chunks.push(
+                ...this.joinChunks(
+                    ", ",
+                    expressions.map(e => this.printExpression(e))
+                )
+            );
         } else {
             chunks.push("\n");
             this.pushIndent();
diff --git a/src/TSTransformers.ts b/src/TSTransformers.ts
index 710e3ac0e..a2b606465 100644
--- a/src/TSTransformers.ts
+++ b/src/TSTransformers.ts
@@ -20,8 +20,8 @@ export function getCustomTransformers(
     const transformersFromOptions = loadTransformersFromOptions(program, diagnostics);
 
     const afterDeclarations = [
-        ...(transformersFromOptions.afterDeclarations || []),
-        ...(customTransformers.afterDeclarations || []),
+        ...(transformersFromOptions.afterDeclarations ?? []),
+        ...(customTransformers.afterDeclarations ?? []),
     ];
 
     const options = program.getCompilerOptions() as CompilerOptions;
@@ -32,11 +32,11 @@ export function getCustomTransformers(
     return {
         afterDeclarations,
         before: [
-            ...(customTransformers.before || []),
-            ...(transformersFromOptions.before || []),
+            ...(customTransformers.before ?? []),
+            ...(transformersFromOptions.before ?? []),
 
-            ...(transformersFromOptions.after || []),
-            ...(customTransformers.after || []),
+            ...(transformersFromOptions.after ?? []),
+            ...(customTransformers.after ?? []),
             luaTransformer,
         ],
     };
@@ -197,7 +197,7 @@ function loadTransformer(
     } else {
         const isValidGroupTransformer =
             typeof transformer === "object" &&
-            (transformer.before || transformer.after || transformer.afterDeclarations);
+            (transformer.before ?? transformer.after ?? transformer.afterDeclarations) !== undefined;
 
         if (!isValidGroupTransformer) {
             return { error: diagnosticFactories.transformerShouldBeATsTransformerFactory(transform) };
diff --git a/src/bundle.ts b/src/bundle.ts
index 834be2c23..e0ea3249b 100644
--- a/src/bundle.ts
+++ b/src/bundle.ts
@@ -41,7 +41,7 @@ export function bundleTranspiledFiles(
     );
 
     // If any of the modules contains a require for lualib_bundle, add it to the module table.
-    const lualibRequired = transpiledFiles.some(f => f.lua && f.lua.includes(`require("lualib_bundle")`));
+    const lualibRequired = transpiledFiles.some(f => f.lua?.includes(`require("lualib_bundle")`));
     if (lualibRequired) {
         const lualibBundle = emitHost.readFile(path.resolve(__dirname, "../dist/lualib/lualib_bundle.lua"));
         moduleTableEntries.push(`["lualib_bundle"] = function() ${lualibBundle} end,\n`);
diff --git a/src/cli/information.ts b/src/cli/information.ts
index df39c0ecd..08ffb12f4 100644
--- a/src/cli/information.ts
+++ b/src/cli/information.ts
@@ -19,7 +19,7 @@ export function getHelpString(): string {
 
     result += "Options:\n";
     for (const option of optionDeclarations) {
-        const aliasStrings = (option.aliases || []).map(a => "-" + a);
+        const aliasStrings = (option.aliases ?? []).map(a => "-" + a);
         const optionString = aliasStrings.concat(["--" + option.name]).join("|");
 
         const valuesHint = option.type === "enum" ? option.choices.join("|") : option.type;
diff --git a/src/transformation/builtins/index.ts b/src/transformation/builtins/index.ts
index bafe16d2a..22ff84fa3 100644
--- a/src/transformation/builtins/index.ts
+++ b/src/transformation/builtins/index.ts
@@ -1,5 +1,6 @@
 import * as ts from "typescript";
 import * as lua from "../../LuaAST";
+import { assume } from "../../utils";
 import { TransformationContext } from "../context";
 import { importLuaLibFeature, LuaLibFeature } from "../utils/lualib";
 import { getIdentifierSymbolId } from "../utils/symbols";
@@ -60,8 +61,7 @@ export function transformBuiltinCallExpression(
         return;
     }
 
-    // TODO(TypeScript 3.7): assume
-    const propertyCall = node as PropertyCallExpression;
+    assume<PropertyCallExpression>(node);
 
     // If the function being called is of type owner.func, get the type of owner
     const ownerType = context.checker.getTypeAtLocation(node.expression.expression);
@@ -71,40 +71,40 @@ export function transformBuiltinCallExpression(
         const symbolName = symbol && symbol.name;
         switch (symbolName) {
             case "Console":
-                return transformConsoleCall(context, propertyCall);
+                return transformConsoleCall(context, node);
             case "Math":
-                return transformMathCall(context, propertyCall);
+                return transformMathCall(context, node);
             case "StringConstructor":
-                return transformStringConstructorCall(context, propertyCall);
+                return transformStringConstructorCall(context, node);
             case "ObjectConstructor":
-                return transformObjectConstructorCall(context, propertyCall);
+                return transformObjectConstructorCall(context, node);
             case "SymbolConstructor":
-                return transformSymbolConstructorCall(context, propertyCall);
+                return transformSymbolConstructorCall(context, node);
             case "NumberConstructor":
-                return transformNumberConstructorCall(context, propertyCall);
+                return transformNumberConstructorCall(context, node);
         }
     }
 
     if (isStringType(context, ownerType)) {
-        return transformStringPrototypeCall(context, propertyCall);
+        return transformStringPrototypeCall(context, node);
     }
 
     if (isNumberType(context, ownerType)) {
-        return transformNumberPrototypeCall(context, propertyCall);
+        return transformNumberPrototypeCall(context, node);
     }
 
     if (isArrayType(context, ownerType)) {
-        const result = transformArrayPrototypeCall(context, propertyCall);
+        const result = transformArrayPrototypeCall(context, node);
         if (result) {
             return result;
         }
     }
 
     if (isFunctionType(context, ownerType)) {
-        return transformFunctionPrototypeCall(context, propertyCall);
+        return transformFunctionPrototypeCall(context, node);
     }
 
-    const objectResult = transformObjectPrototypeCall(context, propertyCall);
+    const objectResult = transformObjectPrototypeCall(context, node);
     if (objectResult) {
         return objectResult;
     }
diff --git a/src/transformation/context/context.ts b/src/transformation/context/context.ts
index 9e5cdcfc9..5d9a7ef22 100644
--- a/src/transformation/context/context.ts
+++ b/src/transformation/context/context.ts
@@ -23,25 +23,24 @@ export class TransformationContext {
     public readonly resolver: EmitResolver;
 
     public readonly options: CompilerOptions = this.program.getCompilerOptions();
-    public readonly luaTarget = this.options.luaTarget || LuaTarget.LuaJIT;
+    public readonly luaTarget = this.options.luaTarget ?? LuaTarget.LuaJIT;
     public readonly isModule = isFileModule(this.sourceFile);
     public readonly isStrict =
-        this.options.alwaysStrict !== undefined ||
-        (this.options.strict !== undefined && this.options.alwaysStrict !== false) ||
+        (this.options.alwaysStrict ?? this.options.strict) ||
         (this.isModule && this.options.target !== undefined && this.options.target >= ts.ScriptTarget.ES2015);
 
     public constructor(public program: ts.Program, public sourceFile: ts.SourceFile, private visitorMap: VisitorMap) {
         // Use `getParseTreeNode` to get original SourceFile node, before it was substituted by custom transformers.
         // It's required because otherwise `getEmitResolver` won't use cached diagnostics, produced in `emitWorker`
         // and would try to re-analyze the file, which would fail because of replaced nodes.
-        const originalSourceFile = ts.getParseTreeNode(sourceFile, ts.isSourceFile) || sourceFile;
+        const originalSourceFile = ts.getParseTreeNode(sourceFile, ts.isSourceFile) ?? sourceFile;
         this.resolver = this.checker.getEmitResolver(originalSourceFile);
     }
 
     private currentNodeVisitors: Array<ObjectVisitor<ts.Node>> = [];
     public transformNode(node: ts.Node): lua.Node[] {
         // TODO: Move to visitors?
-        if (node.modifiers && node.modifiers.some(modifier => modifier.kind === ts.SyntaxKind.DeclareKeyword)) {
+        if (node.modifiers?.some(modifier => modifier.kind === ts.SyntaxKind.DeclareKeyword)) {
             return [];
         }
 
diff --git a/src/transformation/index.ts b/src/transformation/index.ts
index 198a0c9c7..a720a8ffd 100644
--- a/src/transformation/index.ts
+++ b/src/transformation/index.ts
@@ -34,7 +34,7 @@ export function createVisitorMap(customVisitors: Visitors[]): VisitorMap {
     }
 
     for (const nodeVisitors of visitorMap.values()) {
-        nodeVisitors.sort((a, b) => (a.priority || 0) - (b.priority || 0));
+        nodeVisitors.sort((a, b) => (a.priority ?? 0) - (b.priority ?? 0));
     }
 
     return visitorMap;
diff --git a/src/transformation/utils/annotations.ts b/src/transformation/utils/annotations.ts
index 509d67826..985a4ec26 100644
--- a/src/transformation/utils/annotations.ts
+++ b/src/transformation/utils/annotations.ts
@@ -102,7 +102,7 @@ export function getFileAnnotations(sourceFile: ts.SourceFile): AnnotationsMap {
         // Manually collect jsDoc because `getJSDocTags` includes tags only from closest comment
         const jsDoc = sourceFile.statements[0].jsDoc;
         if (jsDoc) {
-            for (const tag of flatMap(jsDoc, x => x.tags || [])) {
+            for (const tag of flatMap(jsDoc, x => x.tags ?? [])) {
                 const tagName = tag.tagName.text;
                 const annotation = createAnnotation(tagName, tag.comment ? tag.comment.split(" ") : []);
                 if (annotation) {
diff --git a/src/transformation/utils/export.ts b/src/transformation/utils/export.ts
index 91f684ecb..5d7d74c91 100644
--- a/src/transformation/utils/export.ts
+++ b/src/transformation/utils/export.ts
@@ -6,8 +6,8 @@ import { createExportsIdentifier } from "./lua-ast";
 import { getSymbolInfo } from "./symbols";
 import { findFirstNodeAbove, isFileModule } from "./typescript";
 
-export function hasDefaultExportModifier({ modifiers }: ts.Node): boolean {
-    return modifiers !== undefined && modifiers.some(modifier => modifier.kind === ts.SyntaxKind.DefaultKeyword);
+export function hasDefaultExportModifier(node: ts.Node): boolean {
+    return (node.modifiers ?? []).some(modifier => modifier.kind === ts.SyntaxKind.DefaultKeyword);
 }
 
 export const createDefaultExportIdentifier = (original: ts.Node): lua.Identifier =>
diff --git a/src/transformation/utils/function-context.ts b/src/transformation/utils/function-context.ts
index ca8f27aa8..84f19d17a 100644
--- a/src/transformation/utils/function-context.ts
+++ b/src/transformation/utils/function-context.ts
@@ -129,7 +129,7 @@ function getSignatureDeclarations(
 
 export function getFunctionContextType(context: TransformationContext, type: ts.Type): ContextType {
     if (type.isTypeParameter()) {
-        type = type.getConstraint() || type;
+        type = type.getConstraint() ?? type;
     }
 
     if (type.isUnion()) {
diff --git a/src/transformation/utils/lua-ast.ts b/src/transformation/utils/lua-ast.ts
index 5473650b7..6043a4c07 100644
--- a/src/transformation/utils/lua-ast.ts
+++ b/src/transformation/utils/lua-ast.ts
@@ -145,7 +145,7 @@ export function createLocalOrExportedOrGlobalDeclaration(
         return [];
     }
 
-    const exportScope = overrideExportScope || getIdentifierExportScope(context, identifiers[0]);
+    const exportScope = overrideExportScope ?? getIdentifierExportScope(context, identifiers[0]);
     if (exportScope) {
         // exported
         if (!rhs) {
@@ -218,7 +218,7 @@ export function createLocalOrExportedOrGlobalDeclaration(
         if (functionSymbolId && scope.functionDefinitions) {
             const definitions = scope.functionDefinitions.get(functionSymbolId);
             if (definitions) {
-                definitions.definition = declaration || assignment;
+                definitions.definition = declaration ?? assignment;
             }
         }
     }
diff --git a/src/transformation/utils/scope.ts b/src/transformation/utils/scope.ts
index 31aa9a9fd..5077bcc42 100644
--- a/src/transformation/utils/scope.ts
+++ b/src/transformation/utils/scope.ts
@@ -78,7 +78,7 @@ export function findScope(context: TransformationContext, scopeTypes: ScopeType)
 
 const scopeIdCounters = new WeakMap<TransformationContext, number>();
 export function pushScope(context: TransformationContext, scopeType: ScopeType): void {
-    const nextScopeId = (scopeIdCounters.get(context) || 0) + 1;
+    const nextScopeId = (scopeIdCounters.get(context) ?? 0) + 1;
     scopeIdCounters.set(context, nextScopeId);
 
     const scopeStack = getScopeStack(context);
diff --git a/src/transformation/utils/symbols.ts b/src/transformation/utils/symbols.ts
index 310c09453..a08197c72 100644
--- a/src/transformation/utils/symbols.ts
+++ b/src/transformation/utils/symbols.ts
@@ -8,7 +8,7 @@ import { getFirstDeclarationInFile } from "./typescript";
 
 const symbolIdCounters = new WeakMap<TransformationContext, number>();
 function nextSymbolId(context: TransformationContext): lua.SymbolId {
-    const symbolId = (symbolIdCounters.get(context) || 0) + 1;
+    const symbolId = (symbolIdCounters.get(context) ?? 0) + 1;
     symbolIdCounters.set(context, symbolId);
     return symbolId as lua.SymbolId;
 }
diff --git a/src/transformation/utils/typescript/index.ts b/src/transformation/utils/typescript/index.ts
index 7007beaaa..b6b5e6a1a 100644
--- a/src/transformation/utils/typescript/index.ts
+++ b/src/transformation/utils/typescript/index.ts
@@ -43,7 +43,7 @@ export function findFirstNodeAbove<T extends ts.Node>(node: ts.Node, callback: (
 }
 
 export function getFirstDeclarationInFile(symbol: ts.Symbol, sourceFile: ts.SourceFile): ts.Declaration | undefined {
-    const declarations = (symbol.getDeclarations() || []).filter(
+    const declarations = (symbol.getDeclarations() ?? []).filter(
         // TODO: getSourceFile?
         declaration => findFirstNodeAbove(declaration, ts.isSourceFile) === sourceFile
     );
@@ -86,7 +86,7 @@ export function isStandardLibraryType(
 }
 
 export function inferAssignedType(context: TransformationContext, expression: ts.Expression): ts.Type {
-    return context.checker.getContextualType(expression) || context.checker.getTypeAtLocation(expression);
+    return context.checker.getContextualType(expression) ?? context.checker.getTypeAtLocation(expression);
 }
 
 export function getAllCallSignatures(type: ts.Type): readonly ts.Signature[] {
diff --git a/src/transformation/utils/typescript/types.ts b/src/transformation/utils/typescript/types.ts
index 2252e18d7..b6bea5bbb 100644
--- a/src/transformation/utils/typescript/types.ts
+++ b/src/transformation/utils/typescript/types.ts
@@ -65,7 +65,7 @@ function forTypeOrAnySupertype(
         type = context.checker.getDeclaredTypeOfSymbol(type.symbol);
     }
 
-    return (type.getBaseTypes() || []).some(superType => forTypeOrAnySupertype(context, superType, predicate));
+    return (type.getBaseTypes() ?? []).some(superType => forTypeOrAnySupertype(context, superType, predicate));
 }
 
 export function isArrayType(context: TransformationContext, type: ts.Type): boolean {
diff --git a/src/transformation/visitors/binary-expression/compound.ts b/src/transformation/visitors/binary-expression/compound.ts
index b810bc9f8..70340fbeb 100644
--- a/src/transformation/visitors/binary-expression/compound.ts
+++ b/src/transformation/visitors/binary-expression/compound.ts
@@ -49,7 +49,7 @@ const compoundToAssignmentTokens: Record<ts.CompoundAssignmentOperator, ts.Binar
 };
 
 export const isCompoundAssignmentToken = (token: ts.BinaryOperator): token is ts.CompoundAssignmentOperator =>
-    (compoundToAssignmentTokens as any)[token] !== undefined;
+    token in compoundToAssignmentTokens;
 
 export const unwrapCompoundAssignmentToken = (token: ts.CompoundAssignmentOperator) =>
     compoundToAssignmentTokens[token];
diff --git a/src/transformation/visitors/class/members/fields.ts b/src/transformation/visitors/class/members/fields.ts
index c2cf8f95a..87b91e235 100644
--- a/src/transformation/visitors/class/members/fields.ts
+++ b/src/transformation/visitors/class/members/fields.ts
@@ -40,7 +40,7 @@ export function transformClassInstanceFields(
                 getterName,
                 lua.createNilLiteral(),
             ]),
-            classDeclaration.members.find(ts.isConstructorDeclaration) || classDeclaration
+            classDeclaration.members.find(ts.isConstructorDeclaration) ?? classDeclaration
         );
         statements.push(resetGetter);
     }
diff --git a/src/transformation/visitors/class/new.ts b/src/transformation/visitors/class/new.ts
index a35cad983..06236c39e 100644
--- a/src/transformation/visitors/class/new.ts
+++ b/src/transformation/visitors/class/new.ts
@@ -77,7 +77,7 @@ export const transformNewExpression: FunctionVisitor<ts.NewExpression> = (node,
 
         return lua.createCallExpression(
             lua.createIdentifier(customConstructorAnnotation.args[0]),
-            transformArguments(context, node.arguments || []),
+            transformArguments(context, node.arguments ?? []),
             node
         );
     }
diff --git a/src/transformation/visitors/class/utils.ts b/src/transformation/visitors/class/utils.ts
index 45dec19cf..b75d1855b 100644
--- a/src/transformation/visitors/class/utils.ts
+++ b/src/transformation/visitors/class/utils.ts
@@ -3,7 +3,7 @@ import { TransformationContext } from "../../context";
 import { AnnotationKind, getTypeAnnotations } from "../../utils/annotations";
 
 export function isStaticNode(node: ts.Node): boolean {
-    return node.modifiers !== undefined && node.modifiers.some(m => m.kind === ts.SyntaxKind.StaticKeyword);
+    return (node.modifiers ?? []).some(m => m.kind === ts.SyntaxKind.StaticKeyword);
 }
 
 export function getExtendedTypeNode(
diff --git a/src/transformation/visitors/errors.ts b/src/transformation/visitors/errors.ts
index f8d06c6ed..c41e4aff7 100644
--- a/src/transformation/visitors/errors.ts
+++ b/src/transformation/visitors/errors.ts
@@ -26,8 +26,10 @@ export const transformTryStatement: FunctionVisitor<ts.TryStatement> = (statemen
         let [catchBlock, catchScope] = transformScopeBlock(context, statement.catchClause.block, ScopeType.Catch);
         if (statement.catchClause.variableDeclaration) {
             // Replace ____returned with catch variable
-            returnedIdentifier = transformIdentifier(context, statement.catchClause.variableDeclaration
-                .name as ts.Identifier);
+            returnedIdentifier = transformIdentifier(
+                context,
+                statement.catchClause.variableDeclaration.name as ts.Identifier
+            );
         } else if (tryScope.functionReturned || catchScope.functionReturned) {
             returnedIdentifier = lua.createIdentifier("____returned");
         }
diff --git a/src/transformation/visitors/function.ts b/src/transformation/visitors/function.ts
index 10e3dbea3..070097db9 100644
--- a/src/transformation/visitors/function.ts
+++ b/src/transformation/visitors/function.ts
@@ -276,7 +276,7 @@ export const transformFunctionDeclaration: FunctionVisitor<ts.FunctionDeclaratio
             scope.functionDefinitions = new Map();
         }
 
-        const functionInfo = { referencedSymbols: functionScope.referencedSymbols || new Map() };
+        const functionInfo = { referencedSymbols: functionScope.referencedSymbols ?? new Map() };
         scope.functionDefinitions.set(name.symbolId, functionInfo);
     }
 
diff --git a/src/transformation/visitors/variable-declaration.ts b/src/transformation/visitors/variable-declaration.ts
index 9175ba7c5..074198af1 100644
--- a/src/transformation/visitors/variable-declaration.ts
+++ b/src/transformation/visitors/variable-declaration.ts
@@ -61,7 +61,7 @@ export function transformBindingPattern(
         // The identifier of the new variable
         const variableName = transformIdentifier(context, element.name as ts.Identifier);
         // The field to extract
-        const propertyName = transformPropertyName(context, element.propertyName || element.name);
+        const propertyName = transformPropertyName(context, element.propertyName ?? element.name);
 
         let expression: lua.Expression;
         if (element.dotDotDotToken) {
@@ -73,8 +73,8 @@ export function transformBindingPattern(
                     lua.createTableFieldExpression(
                         lua.createBooleanLiteral(true),
                         lua.createStringLiteral(
-                            ((e.propertyName || e.name) as ts.Identifier).text,
-                            e.propertyName || e.name
+                            ((e.propertyName ?? e.name) as ts.Identifier).text,
+                            e.propertyName ?? e.name
                         )
                     )
                 );
diff --git a/src/tstl.ts b/src/tstl.ts
index e37073442..3a6446b15 100644
--- a/src/tstl.ts
+++ b/src/tstl.ts
@@ -8,7 +8,7 @@ import { createDiagnosticReporter } from "./cli/report";
 import { createConfigFileUpdater, locateConfigFile, parseConfigFileWithSystem } from "./cli/tsconfig";
 
 function shouldBePretty(options?: ts.CompilerOptions): boolean {
-    return !options || options.pretty === undefined
+    return options?.pretty === undefined
         ? ts.sys.writeOutputIsTTY !== undefined && ts.sys.writeOutputIsTTY()
         : Boolean(options.pretty);
 }
diff --git a/src/utils.ts b/src/utils.ts
index 8bf18a21a..7b29b553a 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -70,3 +70,5 @@ export function castEach<TOriginal, TCast extends TOriginal>(
 export function assertNever(_value: never): never {
     throw new Error("Value is expected to be never");
 }
+
+export function assume<T>(_value: any): asserts _value is T {}
diff --git a/test/setup.ts b/test/setup.ts
index dff900cb9..8305ec264 100644
--- a/test/setup.ts
+++ b/test/setup.ts
@@ -3,7 +3,7 @@ import * as util from "./util";
 
 declare global {
     namespace jest {
-        interface Matchers<R> {
+        interface Matchers<R, T> {
             toThrowExactError(error: Error): R;
             toHaveDiagnostics(): R;
         }
diff --git a/test/unit/builtins/array.spec.ts b/test/unit/builtins/array.spec.ts
index 56d144e02..6c439a920 100644
--- a/test/unit/builtins/array.spec.ts
+++ b/test/unit/builtins/array.spec.ts
@@ -144,16 +144,17 @@ describe("array.length", () => {
     });
 
     describe("set", () => {
-        test.each([{ length: 0, newLength: 0 }, { length: 1, newLength: 1 }, { length: 7, newLength: 3 }])(
-            "removes extra elements",
-            ({ length, newLength }) => {
-                util.testFunction`
-                    const array = [1, 2, 3];
-                    array.length = ${length};
-                    return array.length;
-                `.expectToEqual(newLength);
-            }
-        );
+        test.each([
+            { length: 0, newLength: 0 },
+            { length: 1, newLength: 1 },
+            { length: 7, newLength: 3 },
+        ])("removes extra elements", ({ length, newLength }) => {
+            util.testFunction`
+                const array = [1, 2, 3];
+                array.length = ${length};
+                return array.length;
+            `.expectToEqual(newLength);
+        });
 
         test.each([0, 1, 7])("returns right-hand side value", length => {
             util.testExpression`[1, 2, 3].length = ${length}`.expectToEqual(length);
@@ -422,17 +423,17 @@ test.each([{ args: [1] }, { args: [1, 2, 3] }])("array.push (%p)", ({ args }) =>
     `.expectToMatchJsResult();
 });
 
-// tslint:disable-next-line: no-null-keyword
-test.each([{ array: [1, 2, 3], expected: [3, 2] }, { array: [1, 2, 3, null], expected: [3, 2] }])(
-    "array.pop (%p)",
-    ({ array, expected }) => {
-        util.testFunction`
-            const array = ${util.formatCode(array)};
-            const value = array.pop();
-            return [value, array.length];
-        `.expectToEqual(expected);
-    }
-);
+test.each([
+    { array: [1, 2, 3], expected: [3, 2] },
+    // tslint:disable-next-line: no-null-keyword
+    { array: [1, 2, 3, null], expected: [3, 2] },
+])("array.pop (%p)", ({ array, expected }) => {
+    util.testFunction`
+        const array = ${util.formatCode(array)};
+        const value = array.pop();
+        return [value, array.length];
+    `.expectToEqual(expected);
+});
 
 test.each([{ array: [1, 2, 3] }, { array: [1, 2, 3, 4] }, { array: [1] }, { array: [] }])(
     "array.reverse (%p)",
diff --git a/test/unit/builtins/string.spec.ts b/test/unit/builtins/string.spec.ts
index 7f92a2805..7ecf860c7 100644
--- a/test/unit/builtins/string.spec.ts
+++ b/test/unit/builtins/string.spec.ts
@@ -64,12 +64,15 @@ test.each([
     util.testExpression`"${inp}".replace(${util.formatCode(searchValue, replaceValue)})`.expectToMatchJsResult();
 });
 
-test.each([["", ""], ["hello", "test"], ["hello", "test", "bye"], ["hello", 42], [42, "hello"]])(
-    "string.concat[+] (%p)",
-    (...elements) => {
-        util.testExpression(elements.map(e => util.formatCode(e)).join(" + ")).expectToMatchJsResult();
-    }
-);
+test.each([
+    ["", ""],
+    ["hello", "test"],
+    ["hello", "test", "bye"],
+    ["hello", 42],
+    [42, "hello"],
+])("string.concat[+] (%p)", (...elements) => {
+    util.testExpression(elements.map(e => util.formatCode(e)).join(" + ")).expectToMatchJsResult();
+});
 
 test.each([
     { str: "", args: ["", ""] },
@@ -99,12 +102,12 @@ test.each([
     util.testExpressionTemplate`${inp}.indexOf(${searchValue}, ${offset})`.expectToMatchJsResult();
 });
 
-test.each([{ inp: "hello test", searchValue: "t", x: 4, y: 3 }, { inp: "hello test", searchValue: "h", x: 3, y: 4 }])(
-    "string.indexOf with offset expression (%p)",
-    ({ inp, searchValue, x, y }) => {
-        util.testExpressionTemplate`${inp}.indexOf(${searchValue}, 2 > 1 && ${x} || ${y})`.expectToMatchJsResult();
-    }
-);
+test.each([
+    { inp: "hello test", searchValue: "t", x: 4, y: 3 },
+    { inp: "hello test", searchValue: "h", x: 3, y: 4 },
+])("string.indexOf with offset expression (%p)", ({ inp, searchValue, x, y }) => {
+    util.testExpressionTemplate`${inp}.indexOf(${searchValue}, 2 > 1 && ${x} || ${y})`.expectToMatchJsResult();
+});
 
 test.each([
     { inp: "hello test", args: [] },
@@ -125,13 +128,13 @@ test.each([
     util.testExpression`"${inp}".substring(${util.formatCode(...args)})`.expectToMatchJsResult();
 });
 
-test.each([{ inp: "hello test", start: 1, ignored: 0 }, { inp: "hello test", start: 3, ignored: 0, end: 5 }])(
-    "string.substring with expression (%p)",
-    ({ inp, start, ignored, end }) => {
-        const paramStr = `2 > 1 && ${start} || ${ignored}` + (end ? `, ${end}` : "");
-        util.testExpression`"${inp}".substring(${paramStr})`.expectToMatchJsResult();
-    }
-);
+test.each([
+    { inp: "hello test", start: 1, ignored: 0 },
+    { inp: "hello test", start: 3, ignored: 0, end: 5 },
+])("string.substring with expression (%p)", ({ inp, start, ignored, end }) => {
+    const paramStr = `2 > 1 && ${start} || ${ignored}` + (end ? `, ${end}` : "");
+    util.testExpression`"${inp}".substring(${paramStr})`.expectToMatchJsResult();
+});
 
 test.each([
     { inp: "hello test", args: [0] },
@@ -142,15 +145,15 @@ test.each([
     util.testExpression`"${inp}".substr(${util.formatCode(...args)})`.expectToMatchJsResult();
 });
 
-test.each([{ inp: "hello test", start: 1, ignored: 0 }, { inp: "hello test", start: 3, ignored: 0, end: 2 }])(
-    "string.substr with expression (%p)",
-    ({ inp, start, ignored, end }) => {
-        const paramStr = `2 > 1 && ${start} || ${ignored}` + (end ? `, ${end}` : "");
-        const result = util.transpileAndExecute(`return "${inp}".substr(${paramStr})`);
+test.each([
+    { inp: "hello test", start: 1, ignored: 0 },
+    { inp: "hello test", start: 3, ignored: 0, end: 2 },
+])("string.substr with expression (%p)", ({ inp, start, ignored, end }) => {
+    const paramStr = `2 > 1 && ${start} || ${ignored}` + (end ? `, ${end}` : "");
+    const result = util.transpileAndExecute(`return "${inp}".substr(${paramStr})`);
 
-        expect(result).toBe(inp.substr(start, end));
-    }
-);
+    expect(result).toBe(inp.substr(start, end));
+});
 
 test.each(["", "h", "hello"])("string.length (%p)", input => {
     util.testExpressionTemplate`${input}.length`.expectToMatchJsResult();
@@ -185,12 +188,13 @@ test.each([
     util.testExpressionTemplate`${inp}.charAt(${index})`.expectToMatchJsResult();
 });
 
-test.each([{ inp: "hello test", index: 1 }, { inp: "hello test", index: 2 }, { inp: "hello test", index: 3 }])(
-    "string.charCodeAt (%p)",
-    ({ inp, index }) => {
-        util.testExpressionTemplate`${inp}.charCodeAt(${index})`.expectToMatchJsResult();
-    }
-);
+test.each([
+    { inp: "hello test", index: 1 },
+    { inp: "hello test", index: 2 },
+    { inp: "hello test", index: 3 },
+])("string.charCodeAt (%p)", ({ inp, index }) => {
+    util.testExpressionTemplate`${inp}.charCodeAt(${index})`.expectToMatchJsResult();
+});
 
 test.each([
     { inp: "hello test", index: 1, ignored: 0 },
diff --git a/test/unit/classes/classes.spec.ts b/test/unit/classes/classes.spec.ts
index cfb1451aa..d2155ce18 100644
--- a/test/unit/classes/classes.spec.ts
+++ b/test/unit/classes/classes.spec.ts
@@ -730,19 +730,19 @@ test("Exported class super call", () => {
     expect(util.transpileExecuteAndReturnExport(code, "baz")).toBe("bar");
 });
 
-test.each([{ input: "(new Foo())", expectResult: "foo" }, { input: "Foo", expectResult: "bar" }])(
-    "Class method name collision (%p)",
-    ({ input, expectResult }) => {
-        const code = `
-            class Foo {
-                public method() { return "foo"; }
-                public static method() { return "bar"; }
-            }
-            return ${input}.method();
-        `;
-        expect(util.transpileAndExecute(code)).toBe(expectResult);
-    }
-);
+test.each([
+    { input: "(new Foo())", expectResult: "foo" },
+    { input: "Foo", expectResult: "bar" },
+])("Class method name collision (%p)", ({ input, expectResult }) => {
+    const code = `
+        class Foo {
+            public method() { return "foo"; }
+            public static method() { return "bar"; }
+        }
+        return ${input}.method();
+    `;
+    expect(util.transpileAndExecute(code)).toBe(expectResult);
+});
 
 test("Class static instance of self", () => {
     const code = `
diff --git a/test/unit/functions/functions.spec.ts b/test/unit/functions/functions.spec.ts
index 9cc7bb468..c9553f96e 100644
--- a/test/unit/functions/functions.spec.ts
+++ b/test/unit/functions/functions.spec.ts
@@ -237,26 +237,26 @@ test("Object method declaration", () => {
     `.expectToMatchJsResult();
 });
 
-test.each([{ args: ["bar"], expected: "foobar" }, { args: ["baz", "bar"], expected: "bazbar" }])(
-    "Function overload (%p)",
-    ({ args, expected }) => {
-        util.testFunction`
-            class O {
-                prop = "foo";
-                method(s: string): string;
-                method(this: void, s1: string, s2: string): string;
-                method(s1: string) {
-                    if (typeof this === "string") {
-                        return this + s1;
-                    }
-                    return this.prop + s1;
+test.each([
+    { args: ["bar"], expected: "foobar" },
+    { args: ["baz", "bar"], expected: "bazbar" },
+])("Function overload (%p)", ({ args, expected }) => {
+    util.testFunction`
+        class O {
+            prop = "foo";
+            method(s: string): string;
+            method(this: void, s1: string, s2: string): string;
+            method(s1: string) {
+                if (typeof this === "string") {
+                    return this + s1;
                 }
-            };
-            const o = new O();
-            return o.method(${util.formatCode(...args)});
-        `.expectToEqual(expected);
-    }
-);
+                return this.prop + s1;
+            }
+        };
+        const o = new O();
+        return o.method(${util.formatCode(...args)});
+    `.expectToEqual(expected);
+});
 
 test("Nested Function", () => {
     util.testFunction`
@@ -276,7 +276,10 @@ test("Nested Function", () => {
     `.expectToMatchJsResult();
 });
 
-test.each([{ s1: "abc", s2: "abc" }, { s1: "abc", s2: "def" }])("Dot vs Colon method call (%p)", ({ s1, s2 }) => {
+test.each([
+    { s1: "abc", s2: "abc" },
+    { s1: "abc", s2: "def" },
+])("Dot vs Colon method call (%p)", ({ s1, s2 }) => {
     util.testFunction`
         class MyClass {
             dotMethod(this: void, s: string) {
diff --git a/test/unit/hoisting.spec.ts b/test/unit/hoisting.spec.ts
index 19dce6516..e8ee28947 100644
--- a/test/unit/hoisting.spec.ts
+++ b/test/unit/hoisting.spec.ts
@@ -116,10 +116,11 @@ test.each([
     expect(result).toBe(expectResult);
 });
 
-test.each([{ initializer: "", expectResult: "foofoo" }, { initializer: ' = "bar"', expectResult: "barbar" }])(
-    "Var hoisting from child scope (%p)",
-    ({ initializer, expectResult }) => {
-        const code = `
+test.each([
+    { initializer: "", expectResult: "foofoo" },
+    { initializer: ' = "bar"', expectResult: "barbar" },
+])("Var hoisting from child scope (%p)", ({ initializer, expectResult }) => {
+    const code = `
         foo = "foo";
         let result: string;
         if (true) {
@@ -128,10 +129,9 @@ test.each([{ initializer: "", expectResult: "foofoo" }, { initializer: ' = "bar"
         }
         return foo + result;
     `;
-        const result = util.transpileAndExecute(code);
-        expect(result).toBe(expectResult);
-    }
-);
+    const result = util.transpileAndExecute(code);
+    expect(result).toBe(expectResult);
+});
 
 test("Hoisting due to reference from hoisted function", () => {
     const code = `
diff --git a/test/unit/loops.spec.ts b/test/unit/loops.spec.ts
index fe5ce7461..6e67074d3 100644
--- a/test/unit/loops.spec.ts
+++ b/test/unit/loops.spec.ts
@@ -301,7 +301,16 @@ test.each([{ inp: [0, 1, 2], expected: [1, 2, 3] }])("forof existing variable (%
     expect(result).toBe(JSON.stringify(expected));
 });
 
-test.each([{ inp: [[1, 2], [2, 3], [3, 4]], expected: [3, 5, 7] }])("forof destructing (%p)", ({ inp, expected }) => {
+test.each([
+    {
+        inp: [
+            [1, 2],
+            [2, 3],
+            [3, 4],
+        ],
+        expected: [3, 5, 7],
+    },
+])("forof destructing (%p)", ({ inp, expected }) => {
     const result = util.transpileAndExecute(
         `let objTest = ${JSON.stringify(inp)};
             let arrResultTest = [];
@@ -314,23 +323,29 @@ test.each([{ inp: [[1, 2], [2, 3], [3, 4]], expected: [3, 5, 7] }])("forof destr
     expect(result).toBe(JSON.stringify(expected));
 });
 
-test.each([{ inp: [[1, 2], [2, 3], [3, 4]], expected: [3, 5, 7] }])(
-    "forof destructing with existing variables (%p)",
-    ({ inp, expected }) => {
-        const result = util.transpileAndExecute(
-            `let objTest = ${JSON.stringify(inp)};
-            let arrResultTest = [];
-            let a: number;
-            let b: number;
-            for ([a,b] of objTest) {
-                arrResultTest.push(a + b)
-            }
-            return JSONStringify(arrResultTest);`
-        );
+test.each([
+    {
+        inp: [
+            [1, 2],
+            [2, 3],
+            [3, 4],
+        ],
+        expected: [3, 5, 7],
+    },
+])("forof destructing with existing variables (%p)", ({ inp, expected }) => {
+    const result = util.transpileAndExecute(`
+        let objTest = ${JSON.stringify(inp)};
+        let arrResultTest = [];
+        let a: number;
+        let b: number;
+        for ([a,b] of objTest) {
+            arrResultTest.push(a + b)
+        }
+        return JSONStringify(arrResultTest);
+    `);
 
-        expect(result).toBe(JSON.stringify(expected));
-    }
-);
+    expect(result).toBe(JSON.stringify(expected));
+});
 
 test.each([{ inp: [0, 1, 2, 3, 4], expected: [0, 0, 2, 0, 4] }])("forof with continue (%p)", ({ inp, expected }) => {
     const result = util.transpileAndExecute(
diff --git a/test/unit/transformers/utils.ts b/test/unit/transformers/utils.ts
index 603248dc3..3e1503ba0 100644
--- a/test/unit/transformers/utils.ts
+++ b/test/unit/transformers/utils.ts
@@ -1,6 +1,6 @@
 import * as ts from "typescript";
 
 export function visitAndReplace<T extends ts.Node>(context: ts.TransformationContext, node: T, visitor: ts.Visitor): T {
-    const visit: ts.Visitor = node => visitor(node) || ts.visitEachChild(node, visit, context);
+    const visit: ts.Visitor = node => visitor(node) ?? ts.visitEachChild(node, visit, context);
     return ts.visitNode(node, visit);
 }
diff --git a/test/util.ts b/test/util.ts
index ef7c8c4bd..6ca57509b 100644
--- a/test/util.ts
+++ b/test/util.ts
@@ -476,9 +476,7 @@ const createTestBuilderFactory = <T extends TestBuilder>(
             substitutions = substitutions.map(s => formatCode(s));
         }
 
-        tsCode = template
-            .map((chunk, index) => (substitutions[index - 1] !== undefined ? substitutions[index - 1] : "") + chunk)
-            .join("");
+        tsCode = template.map((chunk, index) => (substitutions[index - 1] ?? "") + chunk).join("");
     }
 
     return new builder(tsCode);