feat(instant): Cleaner config-specific setup

1 files changed, 56 insertions, 17 deletions

diff --git a/packages/instant/webpack.config.js b/packages/instant/webpack.config.js
index 41276809c..284276c1a 100644
--- a/packages/instant/webpack.config.js
+++ b/packages/instant/webpack.config.js
@@ -6,27 +6,64 @@ const webpack = require('webpack');
 // The common js bundle (not this one) is built using tsc.
 // The umd bundle (this one) has a different entrypoint.
 
+const ACCEPTABLE_ENV_NAMES = ['production_standalone', 'production_cdn', 'staging', 'dogfood', 'development'];
+const getEnvironmentName = env => {
+    if (!env) {
+        throw new Error('Please specify env via --env to webpack');
+    }
+    const foundName = ACCEPTABLE_ENV_NAMES.find(e => (env[e] ? e : false));
+    if (!foundName) {
+        throw new Error(
+            `Couldn't find env name, please specify via one of the following CLI arguments: ${acceptableEnvNames.map(
+                i => `--env.${i}`,
+            )}`,
+        );
+    }
+    return foundName;
+};
+
+const getConfigForEnv = environmentName => {
+    switch (environmentName) {
+        case 'production_standalone':
+        case 'production_cdn':
+            return {
+                heapAnalyticsIdEnvName: 'INSTANT_HEAP_ANALYTICS_ID_PRODUCTION',
+                heapAnalyticsIdRequired: environmentName !== 'production_standalone',
+            };
+        case 'staging':
+        case 'dogfood':
+        case 'development':
+            return {
+                heapAnalyticsIdEnvName: 'INSTANT_HEAP_ANALYTICS_ID_DEVELOPMENT',
+                heapAnalyticsIdRequired: environmentName !== 'development',
+            };
+    }
+};
+
 const GIT_SHA = childProcess
     .execSync('git rev-parse HEAD')
     .toString()
     .trim();
+const generateConfig = (environmentName, configOptions) => {
+    const outputPath = process.env.WEBPACK_OUTPUT_PATH || 'umd';
 
-const HEAP_PRODUCTION_ENV_VAR_NAME = 'INSTANT_HEAP_ANALYTICS_ID_PRODUCTION';
-const HEAP_DEVELOPMENT_ENV_VAR_NAME = 'INSTANT_HEAP_ANALYTICS_ID_DEVELOPMENT';
-const getHeapAnalyticsId = modeName => {
-    if (modeName === 'production') {
-        return process.env[HEAP_PRODUCTION_ENV_VAR_NAME];
+    const { heapAnalyticsIdEnvName, heapAnalyticsIdRequired } = configOptions;
+    const heapAnalyticsId = process.env[heapAnalyticsIdEnvName];
+    if (heapAnalyticsIdRequired && !heapAnalyticsId) {
+        throw new Error(
+            `Must define heap analytics id in ENV var ${heapAnalyticsIdEnvName} when building for ${environmentName}`,
+        );
     }
 
-    if (modeName === 'development') {
-        return process.env[HEAP_DEVELOPMENT_ENV_VAR_NAME];
+    const envVars = {
+        GIT_SHA: JSON.stringify(GIT_SHA),
+        INSTANT_ENVIRONMENT: JSON.stringify(environmentName),
+        NPM_PACKAGE_VERSION: JSON.stringify(process.env.npm_package_version),
+    };
+    if (heapAnalyticsId) {
+        envVars.HEAP_ANALYTICS_ID = JSON.stringify(heapAnalyticsId);
     }
 
-    return undefined;
-};
-
-module.exports = (env, argv) => {
-    const outputPath = process.env.WEBPACK_OUTPUT_PATH || 'umd';
     const config = {
         entry: {
             instant: './src/index.umd.ts',
@@ -39,11 +76,7 @@ module.exports = (env, argv) => {
         },
         plugins: [
             new webpack.DefinePlugin({
-                'process.env': {
-                    GIT_SHA: JSON.stringify(GIT_SHA),
-                    HEAP_ANALYTICS_ID: getHeapAnalyticsId(argv.mode),
-                    NPM_PACKAGE_VERSION: JSON.stringify(process.env.npm_package_version),
-                },
+                'process.env': envVars,
             }),
         ],
         devtool: 'source-map',
@@ -79,3 +112,9 @@ module.exports = (env, argv) => {
     };
     return config;
 };
+
+module.exports = (env, _argv) => {
+    const environmentName = getEnvironmentName(env);
+    const configOptions = getConfigForEnv(environmentName);
+    return generateConfig(environmentName, configOptions);
+};