52 lines
1.6 KiB
Markdown
52 lines
1.6 KiB
Markdown
---
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title: Design inheritance
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for: developers
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about: Shows how you can use one design as the basis for another
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---
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If your pattern is based on, or extending, another pattern (some of) your
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pattern parts will need to be drafted by the parent pattern.
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In such a case, rather than return our own draft method for the part, you
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should instantiate the parent pattern, and return its part draft method:
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```js
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import freesewing from "@freesewing/core";
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import Brian from "@freesewing/brian";
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import plugins from "@freesewing/plugin-bundle";
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import config from "../config";
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// Parts
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import draftBack from "./back";
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// Create new design
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const Sorcha = new freesewing.Design(config, plugins);
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// Attach our own draft method to the prototype
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Sorcha.prototype.draftBack = part => draftBack(part);
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// Attach the inherited draft method to the prototype
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Sorcha.prototype.draftBase = function(part) {
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// Getting the base part from Brian
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return new Brian(this.settings).draftBase(part);
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};
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```
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<Warning>
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Because we're using the `this` keyword here, you cannot use the arrow notation.
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</Warning>
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## Configuration
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The inherited pattern parts will use the configuration of your pattern.
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You must take care to make sure that
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your pattern has all the options the parent pattern requires.
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For example, if you inherit from a pattern that has a `chestEase` option, you will
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need to add that option to your own patter, because the inherited parts will depend on it.
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## Dependencies
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When extending a pattern, you should add it as a peer dependency, rather than a regular dependency.
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Doing so will avoid that the parent pattern will get bundled with your own pattern.
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