Add minimal package.json to support npm install

[kateinoigakukun]

First of all, thank you for maintaining this great project! We really appreciate your effort.

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Motivation

We are using wasm build of PDFium from this project in our Web client application by simply vendoring files extracted from the wasm.tgz. However, if we can manage the build artifact as an npm dependency, it would make easier to maintain and upgrade.

Proposal

If we can publish a tarball that is compatible with the format that npm install expects to somewhere like GitHub Releases, it allows us to import the artifacts without vendoring them like below.

$ npm install https://github.com/paulocoutinhox/pdfium-lib/releases/download/<version>/wasm-release.tgz

import PDFiumModule from "pdfium-lib";
import PDFiumWASM from "pdfium-lib/pdfium.wasm?url";

await PDFiumModule({
    instantiateWasm: (info, callback) => {
        fetch(PDFiumWASM).then((response) => {
            WebAssembly.instantiateStreaming(response, info).then(({ instance }) => callback(instance));
        });
    }
})

[paulocoutinhox]

Thanks. Can you test and send a test project to i add it to this project?

[kateinoigakukun]

Sorry for taking time 🙇 I just prepared some scripts to perform a sanity check: https://gist.github.com/kateinoigakukun/987c75f987d4462baf8bac202012b02b#file-pdfium-lib-npm-pkg-md

[paulocoutinhox]

New version launched, can you test? Ty.

[paulocoutinhox]

[paulocoutinhox]

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