JSDOC tag @type crashes tsc

[attila-kun]

TypeScript Version: 3.3.0-dev.20190124

Search Terms:

• tsc jsdoc crash
• TypeError: Cannot read property 'flags' of undefined

Code

This snippet crashes the compiler:

function Foo() { }
/** @type {{}} **/
Foo.Bar = null;

Stack trace:

> ./node_modules/typescript/bin/tsc crash.ts

/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:71419
                throw e;
                ^

TypeError: Cannot read property 'flags' of undefined
    at getMembersOfSymbol (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:30458:27)
    at getTypeFromTypeLiteralOrFunctionOrConstructorTypeNode (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:33423:21)
    at getTypeFromTypeNode (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:33702:28)
    at getJSDocTypeFromAssignmentDeclaration (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:29309:43)
    at getWidenedTypeFromAssignmentDeclaration (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:29260:33)
    at getTypeOfVariableOrParameterOrPropertyWorker (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:29557:21)
    at getTypeOfVariableOrParameterOrProperty (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:29502:48)
    at getTypeOfSymbol (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:29777:24)
    at checkPropertyAccessExpressionOrQualifiedName (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:40629:53)
    at checkPropertyAccessExpression (/home/attila/dev/projects/temp/2019-01-24/tsc-jsdoc-crash/node_modules/typescript/lib/tsc.js:40581:20)

A self contained demonstration can be found here: https://github.com/attila-kun/tsc-jsdoc-crash
Or on the Playground (observe exception in the console): https://www.typescriptlang.org/play/#src=function%20Foo()%20%7B%20%7D%0D%0A%2F**%20%40type%20%7B%7B%7D%7D%20**%2F%0D%0AFoo.Bar%20%3D%20null%3B

Expected behavior:
No crash.

Actual behavior:
tsc crashes.

Related Issues:
#17383
#25264

[TimvdLippe]

This no longer seems to crash on TypeScript 4.0.2.