From f14b23bfbe01d3667fb75be4c739a1e5b48e60a3 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Tue, 20 Oct 2020 11:26:38 -0400
Subject: [PATCH] use regex for detecting import.meta (#1371)

* use regex for detecting import.meta

* move regex out of hot code path

* update snapshot
---
 snowpack/src/build/build-import-proxy.ts | 4 +++-
 test/build/base-url/__snapshots__        | 4 +++-
 test/build/base-url/public/index.js      | 4 +++-
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/snowpack/src/build/build-import-proxy.ts b/snowpack/src/build/build-import-proxy.ts
index 792da5ddba..826b132556 100644
--- a/snowpack/src/build/build-import-proxy.ts
+++ b/snowpack/src/build/build-import-proxy.ts
@@ -14,6 +14,8 @@ const SRI_ERROR_HMR_SNOWPACK = generateSRI(
   readFileSync(path.join(__dirname, '../../assets/hmr-error-overlay.js')),
 );
 
+const importMetaRegex = /import\s*\.\s*meta/;
+
 export function getMetaUrlPath(urlPath: string, config: SnowpackConfig): string {
   let {metaDir} = config.buildOptions || {};
   return path.posix.normalize(path.posix.join('/', metaDir, urlPath));
@@ -30,7 +32,7 @@ export function wrapImportMeta({
   env: boolean;
   config: SnowpackConfig;
 }) {
-  if (!code.includes('import.meta')) {
+  if (!importMetaRegex.test(code)) {
     return code;
   }
   return (
diff --git a/test/build/base-url/__snapshots__ b/test/build/base-url/__snapshots__
index e253b1118f..58682c7876 100644
--- a/test/build/base-url/__snapshots__
+++ b/test/build/base-url/__snapshots__
@@ -77,7 +77,9 @@ export default function doNothing() {
   // I do nothing 🎉
 }
 // Triggers a snowpack meta import URL
-console.log(import.meta.env)"
+console.log(import
+  .meta
+  .env)"
 `;
 
 exports[`snowpack build base-url: build/web_modules/array-flatten.js 1`] = `
diff --git a/test/build/base-url/public/index.js b/test/build/base-url/public/index.js
index 806d99849e..6bd832009f 100644
--- a/test/build/base-url/public/index.js
+++ b/test/build/base-url/public/index.js
@@ -7,4 +7,6 @@ export default function doNothing() {
 }
 
 // Triggers a snowpack meta import URL
-console.log(import.meta.env)
\ No newline at end of file
+console.log(import
+  .meta
+  .env)
\ No newline at end of file