4 files changed, 72 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/index.js b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/index.js
new file mode 100644
index 0000000000..1f5bb211aa
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/index.js
@@ -0,0 +1,6 @@
+module.exports = {
+  rules: {
+    'string-trailing-space': require('./trailing-space-anywhere'),
+    'string-tabs': require('./tabs-anywhere'),
+  },
+};
diff --git a/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/package.json b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/package.json
new file mode 100644
index 0000000000..5685ebfa3c
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "eslint-plugin-gpuweb-cts",
+  "version": "0.0.0",
+  "author": "WebGPU CTS Contributors",
+  "private": true,
+  "license": "BSD-3-Clause",
+  "main": "index.js"
+}
diff --git a/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/tabs-anywhere.js b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/tabs-anywhere.js
new file mode 100644
index 0000000000..82238f8615
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/tabs-anywhere.js
@@ -0,0 +1,29 @@
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Indentation tabs are not allowed, even in multiline strings, due to WPT lint rules. This rule simply disallows tabs anywhere.',
+    },
+    schema: [],
+  },
+  create: context => {
+    const sourceCode = context.getSourceCode();
+
+    return {
+      Program: node => {
+        for (let lineIdx = 0; lineIdx < sourceCode.lines.length; ++lineIdx) {
+          const line = sourceCode.lines[lineIdx];
+          const matches = line.matchAll(/\t/g);
+          for (const match of matches) {
+            context.report({
+              node,
+              loc: { line: lineIdx + 1, column: match.index },
+              message: 'Tabs not allowed.',
+              // fixer is hard to implement, so not implemented.
+            });
+          }
+        }
+      },
+    };
+  },
+};
diff --git a/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/trailing-space-anywhere.js b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/trailing-space-anywhere.js
new file mode 100644
index 0000000000..811b379ff6
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/tools/eslint-plugin-gpuweb-cts/trailing-space-anywhere.js
@@ -0,0 +1,29 @@
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Trailing spaces are not allowed, even in multiline strings, due to WPT lint rules.',
+    },
+    schema: [],
+  },
+  create: context => {
+    const sourceCode = context.getSourceCode();
+
+    return {
+      Program: node => {
+        for (let lineIdx = 0; lineIdx < sourceCode.lines.length; ++lineIdx) {
+          const line = sourceCode.lines[lineIdx];
+          const match = /\s+$/.exec(line);
+          if (match) {
+            context.report({
+              node,
+              loc: { line: lineIdx + 1, column: match.index },
+              message: 'Trailing spaces not allowed.',
+              // fixer is hard to implement, so not implemented.
+            });
+          }
+        }
+      },
+    };
+  },
+};