add node_modules to address #4364

1 files changed, 85 insertions, 0 deletions

diff --git a/node_modules/typhonjs-istanbul-instrument-jspm/src/instrumentIstanbulSystem.js b/node_modules/typhonjs-istanbul-instrument-jspm/src/instrumentIstanbulSystem.js
new file mode 100644
index 000000000..754dd928b
--- /dev/null
+++ b/node_modules/typhonjs-istanbul-instrument-jspm/src/instrumentIstanbulSystem.js
@@ -0,0 +1,85 @@
+'use strict';
+
+import Instrumenter from 'istanbul-lib-instrument';
+
+// Good enough ES6 module detection regex.
+// Format detections not designed to be accurate, but to handle the 99% use case.
+const s_ESM_REGEX = /(^\s*|[}\);\n]\s*)(import\s*(['"]|(\*\s+as\s+)?[^"'\(\)\n;]+\s*from\s*['"]|\{)|export\s+\*\s+from\s+["']|export\s* (\{|default|function|class|var|const|let|async\s+function))/;
+
+/**
+ * Instruments JSPM / SystemJS replacing the `System.translate` hook adding Istanbul instrumentation of loaded source
+ * code before deferring the instrumented source for translation. The instrumentation process occurs on the original
+ * source code and supports ES5 and ES Modules (ES6+).
+ *
+ * @param {object}   System - An instance of SystemJS.
+ *
+ * @param {RegExp}   sourceFilePathRegex - A regex which defines which source files are instrumented; default excludes
+ *                                         any sources with file paths that includes `jspm_packages`.
+ */
+export default function instrumentIstanbulSystem(System, sourceFilePathRegex = /^((?!jspm_packages).)*$/)
+{
+   /* istanbul ignore if */
+   if (typeof System.translate !== 'function')
+   {
+      throw new TypeError("instrumentIstanbulSystem - 'System' is not an instance of the SystemJS API.");
+   }
+
+   /* istanbul ignore if */
+   if (!(sourceFilePathRegex instanceof RegExp))
+   {
+      throw new TypeError("instrumentIstanbulSystem - 'sourceFilePathRegex' is not an instance of RexExp.");
+   }
+
+   // Coverage variable created by Istanbul and stored in global variables.
+   const coverageVariable = Object.keys(global).filter((key) => { return key.startsWith('$$cov_'); })[0];
+
+   /* istanbul ignore if */
+   if (typeof coverageVariable === 'undefined')
+   {
+      throw new TypeError(
+       'instrumentIstanbulSystem - Istanbul coverage variable could not be located in global variables.');
+   }
+
+   // ES5 instrumenter
+   const instrumenter = Instrumenter.createInstrumenter({ coverageVariable });
+
+   // ES6 / ES Modules instrumenter
+   const instrumenterESM = Instrumenter.createInstrumenter({ coverageVariable, esModules: true });
+
+   // Store the original `System.translate` hook.
+   const systemTranslate = System.translate;
+
+   // Override SystemJS translate hook to instrument original sources with Istanbul.
+   System.translate = (load) =>
+   {
+      const filePath = load.address.substr(System.baseURL.length);
+
+      // Use `sourceFilePathRegex` to test file path for source instrumentation.
+      if (sourceFilePathRegex.test(filePath))
+      {
+         /* istanbul ignore next */
+         try
+         {
+            // If a source file passes the ES6 / ES Module regex test then use the ESM instrumenter.
+            if (s_ESM_REGEX.test(load.source) || load.metadata.format === 'esm')
+            {
+               load.source = instrumenterESM.instrumentSync(load.source, filePath);
+            }
+            else
+            {
+               load.source = instrumenter.instrumentSync(load.source, filePath);
+            }
+         }
+         catch (err)
+         {
+            const newErr = new Error(`Unable to instrument '${load.name}' for Istanbul:\n\t${err.message}`);
+            newErr.stack = `Unable to instrument '${load.name}' for istanbul:\n\t${err.stack}`;
+            newErr.originalErr = err.originalErr || err;
+            throw newErr;
+         }
+      }
+
+      // Defer to the original `System.translate` hook.
+      return systemTranslate.call(System, load);
+   };
+}