TS-Merger

Generic TypeScript Merger

Usage

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