esmify

#!/usr/bin/env bash
#
# Convert a typescript action to an ESM module. This expects how Freckle's
# actions are organized; it is not general-purpose.
#
###
set -euo pipefail

# Ensure clean slate
git checkout .
git clean -f .
git checkout main
git pull

# Update local imports to have a .js extension, now that they will be transpiled
find src -name '*.ts' -exec sed -i 's/from\( "\..*\)";/from\1.js"/' {} +

# Add "type: module" after "version"
sed -i 's/^\( *\)\("version":.*\)$/\1\2\n\1"type": "module",/' package.json

# Update test script, with or without trailing comma
sed -i 's/"test": "jest"\(,\)\?$/"test": "NODE_OPTIONS='\''--experimental-vm-modules'\'' jest"\1/' package.json

# Remove any ts jest config...
rm jest.config.ts || true

# and add a json one
cat >jest.config.js <<'EOM'
import { createDefaultPreset } from "ts-jest";

const presetConfig = createDefaultPreset();

const jestConfig = {
  ...presetConfig,
  resetMocks: true,
  testEnvironment: "node",
  extensionsToTreatAsEsm: [".ts"],
  moduleNameMapper: {
    "^(\\.{1,2}/.*)\\.js$": "$1",
  },
  transform: {
    "^.+\\.ts$": [
      "ts-jest",
      {
        useESM: true,
      },
    ],
  },
};

export default jestConfig;
EOM

# Ensure module is NodeNext (some are already, some not)
sed -i 's/"module":.*$/"module": "NodeNext",/' tsconfig.json

# Add moduleResolution: after module: (why are both needed?)
sed -i 's/^\( *\)\("module": .*\)$/\1\2\n\1"moduleResolution": "NodeNext",/' tsconfig.json

# Ensure isolatedModules after strict, this only matches if there's no
# trailing comma (meaning we haven't done this fix already)
sed -i 's/^\( *\)\("strict": true\)$/\1\2,\n\1"isolatedModules": true/' tsconfig.json

yarn test

git checkout -b pb/esm
git commit -a -m 'fix: convert to esm module'

yarn build

git add dist
git commit -m 'chore(dist): build'

create-pr --draft