fix(scripts/commit-msg): prevent commitlint from ever type-checking configuration

**@commitlint/cli** added support for TypeScript-based configurations via `ts-node`, and that has caused a good deal of grief:

conventional-changelog/commitlint#3420
conventional-changelog/commitlint#3351
conventional-changelog/commitlint#3218
conventional-changelog/commitlint#3256

hoverinc/web-react#1792

Both because it's a heavy-ass dependency and because it requires configuration to
work properly. It seems like project-local configuration can affect it's invocation
of ts-node, which happens even JavaScript configuration files now?... lame.

Anyways, this ensures we avoid any type-checking that happens in it's ts-node
invocation until we get a better solution upstream (or contribute one). Ideally,
installing ts-node would be opt-in etc.

Author: jrolfs

src/scripts/__tests__/__snapshots__/commit-msg.js.snap

@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`commit-msg adds env flag with HUSKY_GIT_PARAMS when available 1`] = `commitlint --env HUSKY_GIT_PARAMS --config ./src/config/commitlint.config.js`;
+exports[`commit-msg adds env flag with HUSKY_GIT_PARAMS when available 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --env HUSKY_GIT_PARAMS --config ./src/config/commitlint.config.js`;
 
-exports[`commit-msg calls @commitlint/cli with default args 1`] = `commitlint --config ./src/config/commitlint.config.js --edit`;
+exports[`commit-msg calls @commitlint/cli with default args 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --config ./src/config/commitlint.config.js --edit`;
 
-exports[`commit-msg defaults to \`--edit\` when no args are passed and HUSKY_GIT_PARAMS is not available 1`] = `commitlint --config ./src/config/commitlint.config.js --edit`;
+exports[`commit-msg defaults to \`--edit\` when no args are passed and HUSKY_GIT_PARAMS is not available 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --config ./src/config/commitlint.config.js --edit`;
 
-exports[`commit-msg does not use built-in config with --config 1`] = `commitlint --config ./custom-config.js`;
+exports[`commit-msg does not use built-in config with --config 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --config ./custom-config.js`;
 
-exports[`commit-msg does not use built-in config with commitlint.config.js file 1`] = `commitlint --edit`;
+exports[`commit-msg does not use built-in config with commitlint.config.js file 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --edit`;
 
-exports[`commit-msg forwards args 1`] = `commitlint --config ./src/config/commitlint.config.js --edit .git/COMMIT_EDITMSG`;
+exports[`commit-msg forwards args 1`] = `TS_NODE_TRANSPILE_ONLY=true commitlint --config ./src/config/commitlint.config.js --edit .git/COMMIT_EDITMSG`;

src/scripts/commit-msg.js

@@ -22,7 +22,9 @@ const config = useBuiltinConfig
   : []
 
 const result = spawn.sync(
-  resolveBin('@commitlint/cli', {executable: 'commitlint'}),
+  `TS_NODE_TRANSPILE_ONLY=true ${resolveBin('@commitlint/cli', {
+    executable: 'commitlint',
+  })}`,
   [...env, ...config, ...args, ...defaultEdit],
   {
     stdio: 'inherit',