Adding fork-ts-checker-service-before-start plugin to allow delaying service-start

Author: dannsam

README.md

@@ -124,6 +124,7 @@ This plugin provides some custom webpack hooks (all are sync):
 |------------|-------------|--------|
 |`fork-ts-checker-cancel`| Cancellation has been requested | `cancellationToken` |
 |`fork-ts-checker-waiting`| Waiting for results | `hasTsLint` |
+|`fork-ts-checker-service-before-start`| Async plugin that can be used for delaying `fork-ts-checker-service-start` | - |
 |`fork-ts-checker-service-start`| Service will be started | `tsconfigPath`, `tslintPath`, `watchPaths`, `workersNumber`, `memoryLimit` |
 |`fork-ts-checker-service-start-error` | Cannot start service | `error` |
 |`fork-ts-checker-service-out-of-memory`| Service is out of memory | - |

lib/index.js

@@ -163,31 +163,33 @@ ForkTsCheckerWebpackPlugin.prototype.pluginStop = function () {
 
 ForkTsCheckerWebpackPlugin.prototype.pluginCompile = function () {
   this.compiler.plugin('compile', function () {
-    if (this.cancellationToken) {
-      // request cancellation if there is not finished job
-      this.cancellationToken.requestCancellation();
-      this.compiler.applyPlugins('fork-ts-checker-cancel', this.cancellationToken);
-    }
-    this.checkDone = false;
-    this.compilationDone = false;
-
-    this.started = process.hrtime();
+    this.compiler.applyPluginsAsync('fork-ts-checker-service-before-start', function() {
+      if (this.cancellationToken) {
+        // request cancellation if there is not finished job
+        this.cancellationToken.requestCancellation();
+        this.compiler.applyPlugins('fork-ts-checker-cancel', this.cancellationToken);
+      }
+      this.checkDone = false;
+      this.compilationDone = false;
 
-    // create new token for current job
-    this.cancellationToken = new CancellationToken();
-    if (!this.service || !this.service.connected) {
-      this.spawnService();
-    }
+      this.started = process.hrtime();
 
-    try {
-      this.service.send(this.cancellationToken);
-    } catch (error) {
-      if (!this.silent && this.logger) {
-        this.logger.error(this.colors.red('Cannot start checker service: ' + (error ? error.toString() : 'Unknown error')));
+      // create new token for current job
+      this.cancellationToken = new CancellationToken();
+      if (!this.service || !this.service.connected) {
+        this.spawnService();
       }
 
-      this.compiler.applyPlugins('fork-ts-checker-service-start-error', error);
-    }
+      try {
+        this.service.send(this.cancellationToken);
+      } catch (error) {
+        if (!this.silent && this.logger) {
+          this.logger.error(this.colors.red('Cannot start checker service: ' + (error ? error.toString() : 'Unknown error')));
+        }
+
+        this.compiler.applyPlugins('fork-ts-checker-service-start-error', error);
+      }
+    }.bind(this));
   }.bind(this));
 };
 

test/integration/index.spec.js

@@ -185,4 +185,24 @@ describe('[INTEGRATION] index', function () {
       createCompiler({ tslint: true });
     }).to.not.throw.error;
   });
+
+  it('should allow delaying service-start', function (callback) {
+    var compiler = createCompiler();
+    var delayed = false;
+
+    compiler.plugin('fork-ts-checker-service-before-start', function (cb) {
+      setTimeout(function () {
+        delayed = true;
+
+        cb();
+      }, 0);
+    });
+
+    compiler.plugin('fork-ts-checker-service-start', function () {
+      expect(delayed).to.be.true;
+      callback();
+    });
+
+    compiler.run(function () {});
+  });
 });