Try again with proper build

[tomayac]

@connorjclark This is a second attempt. I guess I simply don't get what to do with Module. I tried to follow this example, but not sure it's applicable.

The main idea is to get rid of this hack, where I append export { potrace, ready as init }; to the output:

esm-potrace-wasm/package.json

Line 25 in 7d81a9c

"terser": "shx echo \"export { potrace, ready as init };\" >> ./dist/temp.js && npx terser --compress --mangle --comments /@license/ --ecma 8 --module --output ./dist/index.js -- ./dist/temp.js && shx rm ./dist/temp.js && shx cp ./src/index.d.ts ./dist/index.d.ts",

The proper way to get a module seems to be -s "MODULARIZE=1" -s "EXPORT_ES6=1".