TS-Merger

Generic TypeScript Merger

Usage

let tsm = require('@devonfw/ts-merger');
let mergedCode: string = tsm.merge(baseContents, patchContents, patchOverrides);

Being:

• baseContents: contents of the base in a string
• patchContents: contents of the patch in a string
• patchOverrides(true/false): Being false, base will have priority in case of conflicts. With true, patch will have priority.

Example

let tsm = require('@devonfw/ts-merger');
let mergedCode: string = tsm.merge(baseContents, pathContents, patchOverrides);

Features

The merger allows merging of this node kinds:

• ImportDeclaration
• ExportDeclaration
• ClassDeclaration
• InterfaceDeclaration
• Decorator
• FunctionDeclaration
• MethodDeclaration
• Parameter
• BodyMethod
• PropertyAssignment
• PropertyDeclaration
• Constructor
• ArrayLiteralExpression
• ObjectLiteralExpression
• CallExpression
• VariableAssignment

This version allows merging of TypeScript files that follow this structure:

• Array of imports
• Array of functions
• Array of variables
• Array of classes

##Examples

Base file

import a from 'b';
import f from 'g';

class Example1 {
    private propertyFromBase: string;

    oneMethod() {
        let variable = 'base';
    }
}

Patch file

import c from 'd';
import h from 'g';

class Example1 {
    private propertyFromPatch: number;

    oneMethod() {
        let variable = 'patch';
    }

    anotherMethod(){}
}

class AnotherClass {}

Resultant merged code (patchOverrides=false)

import a from 'b';
import c from 'd';
import { f, h } from 'g';

class Example1 {
    private propertyFromBase: string;
    private propertyFromPatch: number;

    oneMethod() {
        let variable = 'base';
    }

    anotherMethod(){}
}

class AnotherClass {}

Resulting merged code (patchOverrides=true)

import a from 'b';
import c from 'd';
import { f, h } from 'g';

class Example1 {
    private propertyFromBase: string;
    private propertyFromPatch: number;

    oneMethod() {
        let variable = 'patch';
    }

    anotherMethod(){}
}

class AnotherClass {}

Future version

Next releases will include merge support for:

• Comments support