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fix(coverage): esbuild to preserve legal comments for ignore hints #2496

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Dec 13, 2022
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3 changes: 3 additions & 0 deletions packages/vitest/src/node/plugins/index.ts
Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,9 @@ export async function VitestPlugin(options: UserConfig = {}, ctx = new Vitest('t
const config: ViteConfig = {
esbuild: {
sourcemap: 'external',

// Enables using ignore hint for coverage providers with @preserve keyword
legalComments: 'inline',
},
resolve: {
// by default Vite resolves `module` field, which not always a native ESM module
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -2272,6 +2272,8 @@ exports[`c8 json report 1`] = `
"f": {
"0": 1,
"1": 1,
"10": 0,
"11": 0,
"2": 2,
"3": 2,
"4": 0,
Expand Down Expand Up @@ -2330,6 +2332,54 @@ exports[`c8 json report 1`] = `
},
"name": "get",
},
"10": {
"decl": {
"end": {
"column": 1,
"line": 29,
},
"start": {
"column": 7,
"line": 27,
},
},
"line": 27,
"loc": {
"end": {
"column": 1,
"line": 29,
},
"start": {
"column": 7,
"line": 27,
},
},
"name": "ignoredFunction",
},
"11": {
"decl": {
"end": {
"column": 1,
"line": 29,
},
"start": {
"column": 0,
"line": 29,
},
},
"line": 29,
"loc": {
"end": {
"column": 1,
"line": 29,
},
"start": {
"column": 0,
"line": 29,
},
},
"name": "get",
},
"2": {
"decl": {
"end": {
Expand Down Expand Up @@ -2542,6 +2592,11 @@ exports[`c8 json report 1`] = `
"21": 0,
"22": 0,
"23": 0,
"24": 1,
"25": 1,
"26": 1,
"27": 0,
"28": 0,
"3": 1,
"4": 1,
"5": 2,
Expand Down Expand Up @@ -2721,6 +2776,56 @@ exports[`c8 json report 1`] = `
"line": 24,
},
},
"24": {
"end": {
"column": 0,
"line": 25,
},
"start": {
"column": 0,
"line": 25,
},
},
"25": {
"end": {
"column": 39,
"line": 26,
},
"start": {
"column": 0,
"line": 26,
},
},
"26": {
"end": {
"column": 35,
"line": 27,
},
"start": {
"column": 0,
"line": 27,
},
},
"27": {
"end": {
"column": 59,
"line": 28,
},
"start": {
"column": 0,
"line": 28,
},
},
"28": {
"end": {
"column": 1,
"line": 29,
},
"start": {
"column": 0,
"line": 29,
},
},
"3": {
"end": {
"column": 0,
Expand Down
16 changes: 16 additions & 0 deletions test/coverage-test/coverage-report-tests/istanbul.report.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -21,3 +21,19 @@ test('implicit else is included in branch count', async () => {
expect(fileCoverage.b).toHaveProperty('0')
expect(fileCoverage.b['0']).toHaveLength(2)
})

test('ignored code is excluded from the report', async () => {
const functionName = 'ignoredFunction'
const filename = '<process-cwd>/src/utils.ts'

const coverageMap = await readCoverageJson()
const fileCoverage = coverageMap[filename]

// Function should not be included in report
const functionCoverage = Object.values(fileCoverage.fnMap).find(fn => fn.name === functionName)
expect(functionCoverage).toBe(undefined)

// Function should still be found from the actual sources
const utils = await import('../src/utils')
expect(utils[functionName]).toBeTypeOf('function')
})
1 change: 1 addition & 0 deletions test/coverage-test/coverage-report-tests/utils.ts
Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ interface CoverageFinalJson {
[filename: string]: {
path: string
b: Record<string, number[]>
fnMap: Record<string, { name: string }>
// ... and more unrelated keys
}
}
Expand Down
5 changes: 5 additions & 0 deletions test/coverage-test/src/utils.ts
Original file line number Diff line number Diff line change
Expand Up @@ -22,3 +22,8 @@ export function run() {
// this should not be covered
divide(1, 1)
}

/* istanbul ignore next -- @preserve */
export function ignoredFunction() {
return 'This function is excluded from istanbul coverage'
}