Add a way to pass local variables as options

README.md

@@ -61,6 +61,32 @@ import reduxLogger from 'redux-logger'
 // #endif
 ```
 
+You can pass variables as options to the loader:
+
+```js
+// webpack.config.js
+module: {
+  rules: [{
+    test: /\.js$/,
+    use: [
+      'babel-loader',
+      {
+        loader: 'webpack-conditional-loader',
+        options: {
+          isReady: true
+        }
+    ]
+  }]
+}
+```
+```js
+// myFile.js
+// #if isReady
+console.log(`I'm ready!`)
+// #endif
+
+```
+
 ## Credits
 - [GCC C conditional documentation](https://gcc.gnu.org/onlinedocs/gcc-3.0.2/cpp_4.html)
 

package.json

@@ -11,7 +11,9 @@
     "src/",
     "test/"
   ],
-  "dependencies": {},
+  "dependencies": {
+    "loader-utils": "^1.2.3"
+  },
   "devDependencies": {
     "standard": "^10.0.2",
     "tap": "^10.7.0",

src/index.js

@@ -1,5 +1,6 @@
 /* eslint-disable no-eval */
-const os = require('os');
+const os = require('os')
+const { getOptions } = require('loader-utils')
 
 function getPredicate (line) {
   return /\/\/ #if (.*)/.exec(line)[1]
@@ -37,13 +38,17 @@ function searchBlocks (sourceByLine) {
   return blocks
 }
 
-function getTruthyBlocks (blocks) {
+function getTruthyBlocks (blocks, options) {
   const truthyBlocks = blocks.slice()
   let i = 0
   let action = ''
 
   while (i < truthyBlocks.length) {
     if (truthyBlocks[i] && truthyBlocks[i].type === 'begin') {
+      // Let the predicate see the options we're giving.
+      Object.keys(options).forEach(k => {
+        global[k] = options[k]
+      })
       if (eval(truthyBlocks[i].predicate)) {
         truthyBlocks[i] = undefined
         action = 'deleteNextEndBlock'
@@ -100,7 +105,7 @@ module.exports = function (source) {
   try {
     const sourceByLine = source.split(os.EOL)
     const blocks = searchBlocks(sourceByLine)
-    const truthyBlocks = getTruthyBlocks(blocks)
+    const truthyBlocks = getTruthyBlocks(blocks, getOptions(this))
     const transformedSource = commentCodeInsideBlocks(sourceByLine, truthyBlocks)
 
     return transformedSource.join('\n')

test/index.js

@@ -3,6 +3,8 @@ const truthy = require('../build/truthy')
 const falsey = require('../build/falsey')
 const envVarTruthy = require('../build/env-var-truthy')
 const envVarFalsey = require('../build/env-var-falsey')
+const localVarTruthy = require('../build/local-var-truthy')
+const localVarFalsey = require('../build/local-var-falsey')
 
 tap.test('comment blocks with falsey predicate', (test) => {
   test.equal(falsey, 1)
@@ -23,3 +25,13 @@ tap.test('comment env var blocks with falsey predicate', (test) => {
   test.equal(envVarFalsey, 1)
   test.end()
 })
+
+tap.test('comment env var blocks with falsey predicate', (test) => {
+  test.equal(localVarFalsey, true)
+  test.end()
+})
+
+tap.test('comment env var blocks with falsey predicate', (test) => {
+  test.equal(localVarTruthy, true)
+  test.end()
+})

test/test-files/local-var-falsey.js

@@ -0,0 +1,7 @@
+let a = true
+
+// #if localVar.falsey
+a = false
+// #endif
+
+module.exports = a

test/test-files/local-var-truthy.js

@@ -0,0 +1,7 @@
+let a = false
+
+// #if localVar.truthy
+a = true
+// #endif
+
+module.exports = a

webpack.js

@@ -5,6 +5,8 @@ module.exports = {
   entry: {
     'env-var-truthy': './test/test-files/env-var-truthy.js',
     'env-var-falsey': './test/test-files/env-var-falsey.js',
+    'local-var-truthy': './test/test-files/local-var-truthy.js',
+    'local-var-falsey': './test/test-files/local-var-falsey.js',
     'falsey': './test/test-files/falsey.js',
     'truthy': './test/test-files/truthy.js'
   },
@@ -21,7 +23,15 @@ module.exports = {
   module: {
     rules: [{
       test: /\.js$/,
-      use: ['conditional-loader']
+      use: [{
+        loader: 'conditional-loader',
+        options: {
+          localVar: {
+            truthy: true,
+            falsey: false
+          }
+        }
+      }]
     }]
   }
 }