Parse a font svg, extract the escaped unicode characters, and output a map of the glyph name to its corresponding code. `cat icon-font.svg | node parseCodepoints > icon-font.codepoints`

parseCodepoints.js

const { WritableStream } = require('htmlparser2/lib/WritableStream');

const escape = (_, s) => s.codePointAt().toString(16);

const parserStream = new WritableStream({
  onopentag(name, { unicode, 'glyph-name': glyphName }) {
    if (name === 'glyph' && glyphName && unicode) {
      process.stdout.write(`${glyphName} ${escape`${unicode}`}\n`);
    }
  },
});

process.stdin.pipe(parserStream);