Per-source-file code coverage reports not generated

[daniel3735928559]

Steps performed:

Run npm test from command line.

This uses rollup-plugin-istanbul for instrumentation at build time, and karma-coverage for consuming instrumentation and report generation.

Observed:

Tests run and pass, but error message appears:

ERROR [coverage]: TypeError: Cannot read property 'text' of undefined
    at node_modules/istanbul/lib/report/html.js:286:60
    ...

Also, aggregate information as in build/coverage/report-html/src/index.html is generated, but the line-by-line reports such as build/coverage/report-html/src/doc.js.html are not generated.

Expected:

npm test should complete without error and per-file code HTML coverage reports should be generated by npm test.

[daniel3735928559]

Solved in 6482a97 thanks to this.