univ-fs-webnfs/lib/WnfsFile.js

The universal Filesystem for Web File System Access API (Native File System API)

import { AbstractFile } from "univ-fs";
export class WnfsFile extends AbstractFile {
    constructor(wfs, path) {
        super(wfs, path);
        this.wfs = wfs;
    }
    async _doDelete() {
        const { parent, name } = await this.wfs._getParent(this.path);
        await parent.removeEntry(name);
    }
    async _doRead(_stats, _options) {
        const { parent, name } = await this.wfs._getParent(this.path);
        const fileHandle = await parent.getFileHandle(name);
        return await fileHandle.getFile();
    }
    async _doWrite(data, stats, options) {
        const { parent, name } = await this.wfs._getParent(this.path);
        const fileHandle = await parent.getFileHandle(name, {
            create: stats == null,
        });
        const writable = await fileHandle.createWritable({
            keepExistingData: options.append,
        });
        if (options.append) {
            const stats = await this.head(options);
            await writable.seek(stats.size);
        }
        const conv = await this._getConverter();
        const co = { ...options };
        delete co.start;
        const readable = await conv.convert("readablestream", data, co);
        await conv.pipe(readable, writable);
    }
    supportAppend() {
        return true;
    }
    supportRangeRead() {
        return false;
    }
    supportRangeWrite() {
        return true;
    }
}
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