Ensure that all imported files are watched

In order to handle the case where a new PureScript file is imported, but
fails to compile, the purs-loader now tracks imports for each PureScript
file in order to append any additional imports to the resulting JS.

This ensures that webpack will watch the new file even before it
successfully compiles.

1 files changed, 17 insertions, 5 deletions

diff --git a/src/PsModuleMap.js b/src/PsModuleMap.js
index 2193f02..0ae687c 100644
--- a/src/PsModuleMap.js
+++ b/src/PsModuleMap.js
@@ -8,15 +8,23 @@ const fs = Promise.promisifyAll(require('fs'));
 
 const globby = require('globby');
 
-const debug = require('debug')('purs-loader')
+const debug = require('debug')('purs-loader');
 
-const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i
+const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i;
 
-function match(str) {
+const importModuleRegex = /(?:^|\n)\s*import\s+([\w\.]+)/ig;
+
+function matchModule(str) {
   const matches = str.match(srcModuleRegex);
   return matches && matches[1];
 }
-module.exports.match = match;
+module.exports.match = matchModule;
+
+function matchImports(str) {
+  const matches = str.match(importModuleRegex);
+  return (matches || []).map(a => a.replace(/\n?\s*import\s+/i, ''));
+}
+module.exports.matchImports = matchImports;
 
 function makeMapEntry(filePurs) {
   const dirname = path.dirname(filePurs);
@@ -33,7 +41,9 @@ function makeMapEntry(filePurs) {
 
     const sourceJs = fileMap.fileJs;
 
-    const moduleName = match(sourcePurs);
+    const moduleName = matchModule(sourcePurs);
+
+    const imports = matchImports(sourcePurs);
 
     const map = {};
 
@@ -41,6 +51,8 @@ function makeMapEntry(filePurs) {
 
     map[moduleName].src = path.resolve(filePurs);
 
+    map[moduleName].imports = imports;
+
     if (sourceJs) {
       map[moduleName].ffi = path.resolve(fileJs);
     }