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Fix crash when evaluating Symbol.prototype #182

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Fix crash when evaluating Symbol.prototype #182

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c4bfb42
Add test
fisker Jan 4, 2024
9599f7e
Fix
fisker Jan 4, 2024
5348984
Format
fisker Jan 4, 2024
411e4a0
Linting
fisker Jan 4, 2024
3dac2cf
Update get-string-if-constant.mjs
fisker Jan 4, 2024
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12 changes: 11 additions & 1 deletion src/get-string-if-constant.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,5 +18,15 @@ export function getStringIfConstant(node, initialScope = null) {
}

const evaluated = getStaticValue(node, initialScope)
return evaluated && String(evaluated.value)

if (evaluated) {
// `String(Symbol.prototype)` throws error
try {
return String(evaluated.value)
} catch {
// No op
}
}

return null
}
2 changes: 2 additions & 0 deletions test/get-string-if-constant.mjs
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Expand Up @@ -49,6 +49,7 @@ describe("The 'getStringIfConstant' function", () => {
{ code: "let id = 'abc'; id = 'foo'; id", expected: null },
{ code: "var id = 'abc'; id = 'foo'; id", expected: null },
{ code: "const id = otherId; id", expected: null },
{ code: "Symbol.prototype", expected: null },
]) {
it(`should return ${JSON.stringify(expected)} from ${code}`, () => {
const linter = new eslint.Linter()
Expand All @@ -63,6 +64,7 @@ describe("The 'getStringIfConstant' function", () => {
},
}))
linter.verify(code, {
globals: { Symbol: "readonly" },
parserOptions: { ecmaVersion: 2020 },
rules: { test: "error" },
})
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