canReuseProjectReferences crashes with custom CompilerHost#getParsedCommandLine #31218
Description
TypeScript Version: 3.5.0-dev.20190502
If CompilerHost#getParsedCommandLine is present, parseProjectReferenceConfigFile uses a different branch, which doesn't set SourceFile#path. That's no big deal if getParsedCommandLine uses ts.getParsedCommandLineOfConfigFile as that one already initializes SourceFile#path.
In my case however, getParsedCommandLine uses ts.parseJsonSourceFileConfigFileContent which doesn't set SourceFile#path.
That causes updating an old Program using ts.createProgram to crash in canReuseProjectReferences because getResolvedProjectReferenceByPath(parent.sourceFile.path) returns undefined.
Note that in my particular setup I had a non-existant config file in references, but that shouldn't be necessary to trigger this bug.
If you are not able to reproduce, I can try to extract a minimal repro.
Stacktrace:
TypeError: Cannot read property 'commandLine' of undefined
at /Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:89345:103
at worker (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:90417:34)
at /Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:90434:28
at Object.forEach (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:280:30)
at worker (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:90422:27)
at forEachProjectReference (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:90413:20)
at canReuseProjectReferences (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:89332:21)
at tryReuseStructureFromOldProgram (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:89369:18)
at Object.createProgram (/Users/klaus/code/wotan/node_modules/typescript/lib/typescript.js:89012:34)
at ProjectHost.createProgram (/Users/klaus/code/wotan/packages/wotan/src/project-host.js:188:19)