feat(cli): if no out or json cmd, put out to ./docs (#970)

Author: artentica

src/lib/cli.ts

@@ -7,41 +7,41 @@ import { ParameterHint, ParameterType } from './utils/options/declaration';
 import { getOptionsHelp } from './utils/options/help';
 
 export const enum ExitCode {
-    OptionError  = 1,
+    OptionError = 1,
     NoInputFiles = 2,
-    NoOutput     = 3,
+    NoOutput = 3,
     CompileError = 4,
-    OutputError  = 5
+    OutputError = 5
 }
 
 export class CliApplication extends Application {
     @Option({
-        name:  'out',
-        help:  'Specifies the location the documentation should be written to.',
-        hint:  ParameterHint.Directory
+        name: 'out',
+        help: 'Specifies the location the documentation should be written to.',
+        hint: ParameterHint.Directory
     })
     out!: string;
 
     @Option({
-        name:  'json',
-        help:  'Specifies the location and file name a json file describing the project is written to.',
-        hint:  ParameterHint.File
+        name: 'json',
+        help: 'Specifies the location and file name a json file describing the project is written to.',
+        hint: ParameterHint.File
     })
     json!: string;
 
     @Option({
-        name:  'version',
+        name: 'version',
         short: 'v',
-        help:  'Print the TypeDoc\'s version.',
-        type:  ParameterType.Boolean
+        help: 'Print the TypeDoc\'s version.',
+        type: ParameterType.Boolean
     })
     version!: boolean;
 
     @Option({
-        name:  'help',
+        name: 'help',
         short: 'h',
-        help:  'Print this message.',
-        type:  ParameterType.Boolean
+        help: 'Print this message.',
+        type: ParameterType.Boolean
     })
     help!: boolean;
 
@@ -61,9 +61,6 @@ export class CliApplication extends Application {
         } else if (result.inputFiles.length === 0) {
             typescript.sys.write(getOptionsHelp(this.options));
             process.exit(ExitCode.NoInputFiles);
-        } else if (!this.out && !this.json) {
-            this.logger.error("You must either specify the 'out' or 'json' option.");
-            process.exit(ExitCode.NoOutput);
         } else {
             const src = this.expandInputFiles(result.inputFiles);
             const project = this.convert(src);
@@ -74,6 +71,11 @@ export class CliApplication extends Application {
                 if (this.json) {
                     this.generateJson(project, this.json);
                 }
+                if (!this.out && !this.json) {
+                    this.logger.log("No 'out' or 'json' option has been set");
+                    this.logger.log("The './docs' directory has be set as the output location by default");
+                    this.generateDocs(project, './docs');
+                }
                 if (this.logger.hasErrors()) {
                     process.exit(ExitCode.OutputError);
                 }