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undefined errors on compile due to typedef comments #19081

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undefined errors on compile due to typedef comments#19081
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BugA bug in TypeScriptFixedA PR has been merged for this issue
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TypeScript 2.6
@atishpatel

Description

@atishpatel
atishpatel
opened on Oct 10, 2017

TypeScript Version: 2.5.3

Error
With tsc:

TypeError: Cannot read property '283' of undefined
    at getDeclarationSpaces (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:33121:54)
    at checkExportsOnMergedDeclarations (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:33067:41)
    at checkVariableLikeDeclaration (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:33889:17)
    at checkVariableDeclaration (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:33918:20)
    at checkSourceElement (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35493:28)
    at Object.forEach (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:275:30)
    at checkVariableStatement (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:33926:16)
    at checkSourceElement (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35462:28)
    at Object.forEach (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:275:30)
    at checkSourceFileWorker (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35566:20)
    at checkSourceFile (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35551:13)
    at Object.forEach (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:275:30)
    at getDiagnosticsWorker (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35616:16)
    at getDiagnostics (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:35593:24)
    at Object.getEmitResolver (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:18585:13)
    at emitWorker (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:56112:69)
    at /Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:56088:66
    at runWithCancellationToken (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:56166:24)
    at Object.emit (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:56088:20)
    at compileProgram (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:59134:38)
    at compile (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:59088:26)
    at performCompilation (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:58977:33)
    at Object.executeCommandLine (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:58920:9)
    at Object.<anonymous> (/Users/atish/.config/yarn/global/node_modules/typescript/lib/tsc.js:59278:4)
    at Module._compile (module.js:624:30)
    at Object.Module._extensions..js (module.js:635:10)
    at Module.load (module.js:545:32)
    at tryModuleLoad (module.js:508:12)
    at Function.Module._load (module.js:500:3)
    at Module.require (module.js:568:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/atish/.config/yarn/global/node_modules/typescript/bin/tsc:2:1)
    at Module._compile (module.js:624:30)
    at Object.Module._extensions..js (module.js:635:10)
    at Module.load (module.js:545:32)
    at tryModuleLoad (module.js:508:12)
    at Function.Module._load (module.js:500:3)
    at Function.Module.runMain (module.js:665:10)
    at startup (bootstrap_node.js:201:16)
    at bootstrap_node.js:626:3

With gulp-typescript:

TypeError: Cannot read property 'end' of undefined
    at getFullWidth (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:6840:20)
    at Object.declarationNameToString (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:7190:16)
    at checkExportsOnMergedDeclarations (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:43902:138)
    at checkVariableLikeDeclaration (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:44906:17)
    at checkVariableDeclaration (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:44936:20)
    at checkSourceElement (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:46777:28)
    at Object.forEach (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:1506:30)
    at checkVariableStatement (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:44945:16)
    at checkSourceElement (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:46746:28)
    at Object.forEach (/Users/atish/Development/go/src/github.com/atishpatel/Gigamunch-Backend/node_modules/typescript/lib/typescript.js:1506:30)

Code
I narrowed down the error was caused by these lines of code:
file path: node_modules/@webcomponents/shadycss/src/custom-style-interface.js

/**
 * @typedef {HTMLStyleElement | {getStyle: function():HTMLStyleElement}}
 */
export let CustomStyleProvider;
...
/** @typedef {{
 * customStyles: !Array<!CustomStyleProvider>,
 * addCustomStyle: function(!CustomStyleProvider),
 * getStyleForCustomStyle: function(!CustomStyleProvider): HTMLStyleElement,
 * findStyles: function(),
 * transformCallback: ?function(!HTMLStyleElement),
 * validateCallback: ?function()
 * }}
 */
export let CustomStyleInterfaceInterface;

When I removed the comment with the typedef, everything compiled fine with both tsc and gulp-typescript.

// A *self-contained* demonstration of the problem follows...
// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.

run tsc src/app-shell.ts --allowJs
app.zip

Expected behavior:
Compiles without issues even with the comment.

Actual behavior:
Doesn't. 🙃 But, it does work when the lines are deleted.

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