@github/template-parts/lib/node-template-part.js

An implementation of the TemplateInstance proposal (https://github.com/w3c/webcomponents/blob/159b1600bab02fe9cd794825440a98537d53b389/proposals/Template-Instantiation.md)

const parts = new WeakMap();
export class NodeTemplatePart {
    constructor(node, expression) {
        this.expression = expression;
        parts.set(this, [node]);
        node.textContent = '';
    }
    get value() {
        return parts
            .get(this)
            .map(node => node.textContent)
            .join('');
    }
    set value(string) {
        this.replace(string);
    }
    get previousSibling() {
        return parts.get(this)[0].previousSibling;
    }
    get nextSibling() {
        return parts.get(this)[parts.get(this).length - 1].nextSibling;
    }
    replace(...nodes) {
        var _a, _b;
        const normalisedNodes = nodes.map(node => {
            if (typeof node === 'string')
                return new Text(node);
            return node;
        });
        if (!normalisedNodes.length)
            normalisedNodes.push(new Text(''));
        const node = parts.get(this)[0];
        for (const normalisedNode of normalisedNodes)
            (_a = node.parentNode) === null || _a === void 0 ? void 0 : _a.insertBefore(normalisedNode, node);
        for (const part of parts.get(this))
            (_b = part.parentNode) === null || _b === void 0 ? void 0 : _b.removeChild(part);
        parts.set(this, normalisedNodes);
    }
}
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