Add typescript sample function

Also add support for transpiled ES module interop. Proper ES Module
support is still off on the horizon, but we can handle the common
method for ES Modules that have been transpiled to CommonJS Modules.

Author: scothis

node-invoker.yaml

@@ -18,7 +18,7 @@ spec:
       {{ if .FileExists "package.json" -}}
       ENV FUNCTION_URI /functions/
       COPY . ${FUNCTION_URI}
-      RUN (cd ${FUNCTION_URI} && npm install --production)
+      RUN (cd ${FUNCTION_URI} && npm install --production  --unsafe-perm)
       {{- else -}}
       ENV FUNCTION_URI /functions/{{.Artifact}}
       ADD {{.ArtifactBase}} ${FUNCTION_URI}

samples/typescript/.gitignore

@@ -0,0 +1,6 @@
+/*
+!.gitignore
+!/lib
+!package*.json
+!tsconfig.json
+!README.*

samples/typescript/README.adoc

@@ -0,0 +1,41 @@
+= typescript
+
+[horizontal]
+*Invoker*:: Node
+*Function*:: link:lib/greeter.ts[greeter.ts]
+*Input*:: greeter
+
+=== prerequisites
+
+1. riff is deployed
+2. the `riff` CLI is on your PATH
+3. the node invoker is installed
+
+   riff invokers apply -f https://github.com/projectriff/node-function-invoker/raw/master/node-invoker.yaml
+
+4. the working directory is `samples/typescript`
+
+=== how it works
+
+When a node function contains a package.json file, the package dependencies are installed while
+building the function into a Docker container. This function installs typescript as a dependency
+and then uses a post install script to run the typescript compiler. Once the typescript is
+transpiled, the function behavaes as a standard JS function.
+
+=== create the function and its input topic
+
+```
+riff create node -i greeter
+```
+
+=== publish a message and wait for a reply
+
+```
+riff publish -i greeter -d "riff user" -r
+```
+
+=== delete the function and its input topic
+
+```
+riff delete --all
+```

samples/typescript/lib/greeter.ts

@@ -0,0 +1,4 @@
+
+export default function greeter(name: string) : string {
+  return `Hello ${name}!`;
+}

samples/typescript/package-lock.json

@@ -0,0 +1,16 @@
+{
+  "name": "@projectriff/typescript-sample",
+  "version": "1.0.0",
+  "description": "Typescript greeting sample",
+  "main": "dist/greeter.js",
+  "scripts": {
+    "build": "tsc",
+    "install": "npm run build",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Scott Andrews",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "typescript": "^2.8.1"
+  }
+}

samples/typescript/package.json

@@ -0,0 +1,57 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    "target": "ES2017",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./dist",                       /* Redirect output structure to the directory. */
+    "rootDir": "./lib",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+
+    /* Source Map Options */
+    // "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  }
+}

samples/typescript/tsconfig.json

@@ -24,7 +24,13 @@ const { Message } = require('@projectriff/message');
 // must be run before the function is required
 Message.install();
 
-const fn = require(FUNCTION_URI);
+const fn = (fn => {
+    if (fn.__esModule && typeof fn.default === 'function') {
+        // transpiled ES Module interop
+        return fn.default;
+    }
+    return fn;
+})(require(FUNCTION_URI));
 
 let grpcServer, httpServer;
 

server.js

@@ -127,6 +127,30 @@ describe('server', () => {
         expect(await exitCode).toBe(0);
     });
 
+    it('runs the echo-esmodule-transpile function', async () => {
+        const server = createServerProcess('echo-esmodule-transpile');
+
+        const exitCode = new Promise(resolve => {
+            server.on('exit', resolve);
+        });
+
+        await waitForServer();
+
+        const { payload, headers } = await requestReplyCall(
+            Message.builder()
+                .addHeader('Content-Type', 'text/plain')
+                .addHeader('Accept', 'text/plain')
+                .payload('riff')
+                .build()
+        );
+        expect(headers.getValue('Error')).toBeNull();
+        expect(headers.getValue('Content-Type')).toEqual('text/plain');
+        expect(payload.toString()).toEqual('riff');
+
+        server.kill('SIGINT');
+        expect(await exitCode).toBe(0);
+    });
+
     it('runs the uppercase-payload function', async () => {
         const server = createServerProcess('uppercase-payload');
 

spec/server.spec.js

@@ -0,0 +1,15 @@
+"use strict";
+
+/*
+// ES Module
+export default function echo(value) {
+    return value;
+}
+*/
+
+// CommonJS Module interop transpile
+Object.defineProperty(exports, "__esModule", { value: true });
+function echo(message) {
+    return message;
+}
+exports.default = echo;