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chore(sourcemap): convert inputSourceMap to plain js object #272

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chore(sourcemap): convert inputSourceMap to plain js object #272

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17 changes: 17 additions & 0 deletions src/index.js
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Expand Up @@ -15,6 +15,20 @@ function getRealpath (n) {
}
}

function isPlainObject(value) {
if (
typeof value !== "object" ||
Object.prototype.toString.call(value) !== "[object Object]"
) {
return false
}
const proto = Object.getPrototypeOf(value)
// Object.prototype's __proto__ is null. Every other class's __proto__.__proto__ is
// not null by default. We cannot check if proto === Object.prototype because it
// could come from another realm.
return proto === null || Object.getPrototypeOf(proto) === null
}

const memoize = new Map()
/* istanbul ignore next */
const memosep = path.sep === '/' ? ':' : ';'
Expand Down Expand Up @@ -113,6 +127,9 @@ export default declare(api => {
if (this.opts.useInlineSourceMaps !== false) {
if (!inputSourceMap && this.file.inputMap) {
inputSourceMap = this.file.inputMap.sourcemap
if (!isPlainObject(sourceMapFromFile)) {
inputSourceMap = {...inputSourceMap};
}
}
}
const visitorOptions = {}
Expand Down