generate SourceMap based on JavaScript using source-map in node.js

Question

no matter what I do the map is empty on map.toString().

let path = require("path");
let content = fs.readFileSync(".\\" + file, "utf8");
let filename = path.basename(outFile)
const { code } = js(content);

fs.writeFileSync(outFile, content);
fs.writeFileSync(outMinFile, code);

let gen = new sm.SourceMapGenerator({
    file: filename,
    sourceRoot: "./",
});

gen.setSourceContent("CMS.Layout.js", content);

fs.writeFileSync(outMap, gen.toString());

results in:

{"version":3,"sources":[],"names":[],"mappings":"","file":"CMS.Layout.js","sourceRoot":"./","sourcesContent":[]}

what am I doing wrong?

@LawrenceCherone at the top of the file. var sm = require("generate-source-map"); — SteinTech
– SteinTech, Commented Aug 22, 2020 at 13:38
its not in the question shouldn't presume people know the lib you're using how your loading it.. considering the question is about why new sm.SourceMapGenerator doesn't work — Lawrence Cherone
– Lawrence Cherone, Commented Aug 22, 2020 at 13:41
also, how it initialized the js variable ? On my side I tested the usage of generate-source-map but no luck with ES6 (?) syntax: the strings with backquote throw an error. Not surprising, as generate-source-map has been published 6 years ago, but I don't know which equivalent library I could use. — nouknouk
– nouknouk, Commented Dec 23, 2020 at 9:57

SteinTech · Accepted Answer · 2020-08-22 13:26:32Z

0

I replaced source-map with generate-source-map. much easier and it worked on first try.

let path = require("path");
let content = fs.readFileSync(".\\" + file, "utf8");
let filename = path.basename(outFile)
const { code } = js(content);

fs.writeFileSync(outFile, content);
fs.writeFileSync(outMinFile, code);

let fl = {
    source: content,
    sourceFile: filename
};

let map = sm(fl);

fs.writeFileSync(outMap, map.toString());

answered Aug 22, 2020 at 13:26

SteinTech

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