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raymond-w-ko/source-map-fixer.js

Created March 25, 2022 07:03
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source-map-fixer.js
const FS = require("fs")
const assert = require("assert")
const origSourceMap = JSON.parse(FS.readFileSync("./orig/index.js.map"))
const sections = origSourceMap.sections
assert.equal(sections.length, 1)
const sm = sections[0].map
const lineStart = sections[0].offset.line
const prefix = ";".repeat(lineStart)
sm.mappings = prefix + sm.mappings
FS.writeFileSync("index.js.map", JSON.stringify(sm))
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