Initial Commit

plugins/health-check/webpack-health-plugin.js

@@ -0,0 +1,120 @@
+// webpack-health-plugin.js
+// Webpack plugin that tracks compilation state and health metrics
+
+class WebpackHealthPlugin {
+  constructor() {
+    this.status = {
+      state: 'idle',           // idle, compiling, success, failed
+      errors: [],
+      warnings: [],
+      lastCompileTime: null,
+      lastSuccessTime: null,
+      compileDuration: 0,
+      totalCompiles: 0,
+      firstCompileTime: null,
+    };
+  }
+
+  apply(compiler) {
+    const pluginName = 'WebpackHealthPlugin';
+
+    // Hook: Compilation started
+    compiler.hooks.compile.tap(pluginName, () => {
+      const now = Date.now();
+      this.status.state = 'compiling';
+      this.status.lastCompileTime = now;
+
+      if (!this.status.firstCompileTime) {
+        this.status.firstCompileTime = now;
+      }
+    });
+
+    // Hook: Compilation completed
+    compiler.hooks.done.tap(pluginName, (stats) => {
+      const info = stats.toJson({
+        all: false,
+        errors: true,
+        warnings: true,
+      });
+
+      this.status.totalCompiles++;
+      this.status.compileDuration = Date.now() - this.status.lastCompileTime;
+
+      if (stats.hasErrors()) {
+        this.status.state = 'failed';
+        this.status.errors = info.errors.map(err => ({
+          message: err.message || String(err),
+          stack: err.stack,
+          moduleName: err.moduleName,
+          loc: err.loc,
+        }));
+      } else {
+        this.status.state = 'success';
+        this.status.lastSuccessTime = Date.now();
+        this.status.errors = [];
+      }
+
+      if (stats.hasWarnings()) {
+        this.status.warnings = info.warnings.map(warn => ({
+          message: warn.message || String(warn),
+          moduleName: warn.moduleName,
+          loc: warn.loc,
+        }));
+      } else {
+        this.status.warnings = [];
+      }
+    });
+
+    // Hook: Compilation failed
+    compiler.hooks.failed.tap(pluginName, (error) => {
+      this.status.state = 'failed';
+      this.status.errors = [{
+        message: error.message,
+        stack: error.stack,
+      }];
+      this.status.compileDuration = Date.now() - this.status.lastCompileTime;
+    });
+
+    // Hook: Invalid (file changed, recompiling)
+    compiler.hooks.invalid.tap(pluginName, () => {
+      this.status.state = 'compiling';
+    });
+  }
+
+  getStatus() {
+    return {
+      ...this.status,
+      // Add computed fields
+      isHealthy: this.status.state === 'success',
+      errorCount: this.status.errors.length,
+      warningCount: this.status.warnings.length,
+      hasCompiled: this.status.totalCompiles > 0,
+    };
+  }
+
+  // Get simplified status for quick checks
+  getSimpleStatus() {
+    return {
+      state: this.status.state,
+      isHealthy: this.status.state === 'success',
+      errorCount: this.status.errors.length,
+      warningCount: this.status.warnings.length,
+    };
+  }
+
+  // Reset statistics (useful for testing)
+  reset() {
+    this.status = {
+      state: 'idle',
+      errors: [],
+      warnings: [],
+      lastCompileTime: null,
+      lastSuccessTime: null,
+      compileDuration: 0,
+      totalCompiles: 0,
+      firstCompileTime: null,
+    };
+  }
+}
+
+module.exports = WebpackHealthPlugin;