Read bsconfig instead of webpack options

index.js

@@ -1,3 +1,4 @@
+const { readBsConfig } = require('read-bsconfig')
 const path = require('path')
 const { readFile, readFileSync } = require('fs')
 const { execFile, execFileSync } = require('child_process')
@@ -89,47 +90,70 @@ const getCompiledFileSync = (moduleDir, path) => {
   return transformSrc(moduleDir, res.toString())
 }
 
+const getBsConfigModuleOptions = buildDir =>
+  readBsConfig(buildDir).then(bsconfig => {
+    if (!bsconfig) {
+      throw new Error(`bsconfig not found in ${buildDir}`)
+    }
+
+    if (!bsconfig['package-specs'] || !bsconfig['package-specs'].length) {
+      resolve({ module: 'js', inSource: false })
+    }
+
+    const moduleSpec = bsconfig['package-specs'][0]
+    const moduleDir =
+      typeof moduleSpec === 'string' ? moduleSpec : moduleSpec.module
+    const inSource =
+      typeof moduleSpec === 'string' ? false : moduleSpec['in-source']
+
+    return { moduleDir, inSource }
+  })
+
 module.exports = function loader() {
   const options = getOptions(this) || {}
   const buildDir = options.cwd || CWD
-  const moduleDir = options.module || 'js'
-  const inSourceBuild = options.inSource || false
+  const callback = this.async()
 
   this.addContextDependency(this.context)
-  const callback = this.async()
-  const compiledFilePath = getJsFile(
-    buildDir,
-    moduleDir,
-    this.resourcePath,
-    inSourceBuild
-  )
 
-  getCompiledFile(
-    buildDir,
-    this._compilation,
-    moduleDir,
-    compiledFilePath,
-    (err, res) => {
-      if (err) {
-        if (err instanceof Error) err = err.toString()
-        const errorMessages = getBsbErrorMessages(err)
+  getBsConfigModuleOptions(buildDir).then(bsconfig => {
+    const moduleDir = options.module || bsconfig.moduleDir || 'js'
+    const inSourceBuild = options.inSource || bsconfig.inSource || false
 
-        if (!errorMessages) {
-          if (!(err instanceof Error)) err = new Error(err)
-          this.emitError(err)
-          return callback(err, null)
-        }
+    const compiledFilePath = getJsFile(
+      buildDir,
+      moduleDir,
+      this.resourcePath,
+      inSourceBuild
+    )
 
-        for (let i = 0; i < errorMessages.length - 1; ++i) {
-          this.emitError(new Error(errorMessages[i]))
+    getCompiledFile(
+      buildDir,
+      this._compilation,
+      moduleDir,
+      compiledFilePath,
+      (err, res) => {
+        if (err) {
+          if (err instanceof Error) err = err.toString()
+          const errorMessages = getBsbErrorMessages(err)
+
+          if (!errorMessages) {
+            if (!(err instanceof Error)) err = new Error(err)
+            this.emitError(err)
+            return callback(err, null)
+          }
+
+          for (let i = 0; i < errorMessages.length - 1; ++i) {
+            this.emitError(new Error(errorMessages[i]))
+          }
+
+          callback(new Error(errorMessages[errorMessages.length - 1]), null)
+        } else {
+          callback(null, res)
         }
-
-        callback(new Error(errorMessages[errorMessages.length - 1]), null)
-      } else {
-        callback(null, res)
       }
-    }
-  )
+    )
+  })
 }
 
 module.exports.process = (src, filename) => {

package.json

@@ -27,7 +27,8 @@
   },
   "homepage": "https://github.com/rrdelaney/bs-loader#readme",
   "dependencies": {
-    "loader-utils": "^1.1.0"
+    "loader-utils": "^1.1.0",
+    "read-bsconfig": "^1.0.1"
   },
   "devDependencies": {
     "jest": "^21.0.1",

test/no-config/bsconfig.json

@@ -0,0 +1,10 @@
+{
+  "name": "insource-test",
+  "sources": ["fixtures"],
+  "package-specs": [
+    {
+      "module": "es6",
+      "in-source": true
+    }
+  ]
+}

test/no-config/fixtures/add.re

@@ -0,0 +1 @@
+let add x y => x + y;

test/no-config/fixtures/dec.js

@@ -0,0 +1 @@
+export const dec = x => x - 1;

test/no-config/fixtures/fib.ml

@@ -0,0 +1,9 @@
+external dec : int -> int = "dec" [@@bs.module "./dec"]
+open Add
+
+let fib n  =
+  let rec aux n a b =
+    if n = 0 then a
+    else
+      aux (dec n) b (add a b)
+  in aux n 1 1

test/no-config/fixtures/fib.mli

@@ -0,0 +1 @@
+val fib : int -> int

test/no-config/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "no-config-test",
+  "private": true,
+  "version": "100.0.0",
+  "license": "MIT"
+}

test/no-config/webpack.test.js

@@ -0,0 +1,45 @@
+const webpack = require('webpack')
+const path = require('path')
+const fs = require('fs')
+
+const output = path.join(__dirname, 'output', 'webpack')
+const loader = path.join(__dirname, '..', '..')
+
+const baseConfig = {
+  entry: path.join(__dirname, 'fixtures/fib.ml'),
+  module: {
+    rules: [
+      {
+        test: /\.(re|ml)$/,
+        use: {
+          loader,
+          options: {
+            cwd: __dirname
+          }
+        }
+      }
+    ]
+  },
+  resolve: {
+    extensions: ['.re', '.ml', '.js']
+  },
+  output: {
+    path: output,
+    libraryTarget: 'commonjs2'
+  }
+}
+
+it('runs', done => {
+  webpack(baseConfig, err => {
+    expect(err).toBeNull()
+
+    fs.readdir(output, (err, files) => {
+      expect(err).toBeNull()
+      expect(files.length).toBe(1)
+      const result = require(path.resolve(output, files[0]))
+      expect(result.fib(12)).toBe(233)
+
+      done()
+    })
+  })
+})

test/simple/webpack.test.js

@@ -14,7 +14,6 @@ const baseConfig = {
         use: {
           loader,
           options: {
-            module: 'es6',
             cwd: __dirname
           }
         }