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+# Using packages from JSR with esbuild
+
+[JSR](https://jsr.io/) is a brand new package repository for "modern JavaScript and TypeScript", [launched on March 1st](https://deno.com/blog/jsr_open_beta) by the Deno team as a new alternative to [npm](https://www.npmjs.com/)
+
+My JavaScript ecosystem fluency isn't great, so it took me a bit of work to figure out how to use packages from JSR in my browser.
+
+## Installing yassify with npx jsr add
+
+[@kwhinnery/yassify](https://jsr.io/@kwhinnery/yassify) is the demo package created as part of that [introductory blog post](https://deno.com/blog/jsr_open_beta#publishing-to-jsr). The code itself is a tiny snippet of TypeScript:
+
+```typescript
+/**
+ * Yassify a string of text by appending emoji
+ *
+ * @param str The string of text to yassify.
+ * @returns a string of text with emoji appended
+ */
+export function yassify(str: string): string {
+ return `${str} 💅✨👑`;
+}
+```
+It's published to JSR [here](https://jsr.io/@kwhinnery/yassify). That page includes `npm` instructions for using it that look like this:
+
+> ```bash
+> npx jsr add @kwhinnery/yassify
+> ```
+> ```javascript
+> import * as mod from "@kwhinnery/yassify";
+> ```
+For someone with limited JavaScript ecosystem fluency like myself, that is **not enough information**! I want to run this code in a browser.
+
+Part of the problem is that there are a bewildering array of build tool options. I wanted the thing with the least number of steps - eventually I found this pattern using `esbuild` that seems to work.
+
+I already had `npm` and `npx` installed.
+
+First I created myself a directory for my experiment:
+
+```bash
+mkdir /tmp/site
+cd /tmp/site
+```
+I used the `npx jsr add` command from the JSR documentation:
+```bash
+npx jsr add @kwhinnery/yassify
+```
+Output:
+```
+Setting up .npmrc...ok
+Installing @kwhinnery/yassify...
+$ npm install @kwhinnery/yassify@npm:@jsr/kwhinnery__yassify
+
+added 1 package in 711ms
+
+Completed in 824ms
+```
+This created a bunch of files. Running `find .` reveals the following:
+```
+./node_modules
+./node_modules/@kwhinnery
+./node_modules/@kwhinnery/yassify
+./node_modules/@kwhinnery/yassify/mod.d.ts
+./node_modules/@kwhinnery/yassify/package.json
+./node_modules/@kwhinnery/yassify/mod.js
+./node_modules/.package-lock.json
+./.npmrc
+./package-lock.json
+./package.json
+```
+The `package.json` file contains:
+```json
+{
+ "dependencies": {
+ "@kwhinnery/yassify": "npm:@jsr/kwhinnery__yassify@^1.0.1"
+ }
+}
+```
+`.npmrc` has the following, which is described in the JSR documentation about [npm compatibility](https://jsr.io/docs/npm-compatibility#advanced-setup):
+```
+@jsr:registry=https://npm.jsr.io
+```
+The actual `yassify` code lives in that `./node_modules/@kwhinnery/yassify/mod.js` file.
+
+OK - so we've run a command and got ourselves a `node_modules` directory with the `yassify` code in it. How do we use that in a browser?
+
+## Building an index.js file with esbuild
+
+Here's a tiny JavaScript file that uses `yassify`:
+
+```javascript
+import { yassify } from "@kwhinnery/yassify";
+const h1 = document.querySelector("h1");
+h1.innerText = yassify(h1.innerText);
+```
+And the incantation to have `esbuild` resolve that import and bundle all of the code together into a single file:
+```bash
+npx esbuild index.js --bundle
+```
+That outputs directly to standard out:
+```javascript
+(() => {
+ // node_modules/@kwhinnery/yassify/mod.js
+ function yassify(str) {
+ return `${str} \u{1F485}\u2728\u{1F451}\u{1F984}`;
+ }
+
+ // index.js
+ var h1 = document.querySelector("h1");
+ h1.innerText = yassify(h1.innerText);
+})();
+```
+Or you can add `--outfile=bundle.js` to write it to a file:
+```bash
+npx esbuild index.js --bundle --outfile=bundle.js
+```
+Now here's an `index.html` file that makes use of this bundle:
+```html
+
+
+
+
+ Yassify
+
+
+Yassify
+
+
+
+```
+And that works! You can open `index.html` directly in a browser and it loads and executes the bundled code.
+
+## Trying that with my own package - and failing to get it to work
+
+I have just one package on NPM at the moment: [datasette-table](https://www.npmjs.com/package/datasette-table), an experimental Web Component for rendering tables from [Datasette](https://datasette.io/) on a page.
+
+The source code for that is in [simonw/datasette-table](https://github.com/simonw/datasette-table) on GitHub.
+
+I followed the [JSR intro post](https://deno.com/blog/jsr_open_beta#publishing-to-jsr) and published it to GitHub.
+
+I signed into JSR using my GitHub account and created a scope called `@datasette` - all packages on JSR are published within a scope.
+
+I added a `jsr.json` file te the root of the repository:
+```json
+{
+ "name": "@datasette/table",
+ "version": "0.1.0",
+ "exports": "./datasette-table.js"
+}
+```
+Then I ran this command:
+```bash
+npx jsr publish
+```
+This opened my browser to authenticate and pushed the package to JSR: [jsr.io/@datasette/table](https://jsr.io/@datasette/table). Pretty smooth!
+
+Let's try using that package via the `esbuild` method described above:
+
+```bash
+mkdir /tmp/datasette-demo
+cd /tmp/datasette-demo
+npx jsr add @datasette/table
+echo 'import * as mod from "jsr:@datasette/table";' > index.js
+npx esbuild index.js --bundle --outfile=bundle.js
+```
+And I got this error:
+```
+✘ [ERROR] Could not resolve "npm:lit@^2.2.7"
+
+ node_modules/@datasette/table/datasette-table.js:1:36:
+ 1 │ import {LitElement, html, css} from 'npm:lit@^2.2.7';
+ ╵ ~~~~~~~~~~~~~~~~
+
+ You can mark the path "npm:lit@^2.2.7" as external to exclude it from the bundle, which will
+ remove this error and leave the unresolved path in the bundle.
+
+1 error
+```
+`lit` is the only dependency of my component. I checked `node_modules` and it had all of the `lit` files in it, so they had been installed correctly - but something wasn't working.
+
+I tried adding `--external:npm:lit` to the `esbuild` command, but that didn't help.
+
+This failed too:
+```bash
+npx esbuild index.js --bundle --outfile=bundle.js --external:lit
+```
+
+So I started from scratch:
+```bash
+mkdir /tmp/datasette-demo2
+cd /tmp/datasette-demo2
+```
+This time I used a mechanism I found in the [advanced setup](https://jsr.io/docs/npm-compatibility#advanced-setup) section of the npm compatibility documentation:
+```bash
+echo '@jsr:registry=https://npm.jsr.io' > .npmrc
+npm install @jsr/datasette__table
+```
+`find .` showed me that it had installed the Lit packages, but I also noticed this:
+```bash
+find . | grep datasette
+```
+```
+./node_modules/@jsr/datasette__table
+./node_modules/@jsr/datasette__table/datasette-table.js
+./node_modules/@jsr/datasette__table/package.json
+```
+So the JSR `@datasette/table` package is in a slightly different shape.
+
+Now I tried the `esbuild` command again:
+```bash
+echo 'import * as mod from "@jsr/datasette__table";' > index.js
+npx esbuild index.js --bundle --outfile=bundle.js
+```
+But I got the same error again:
+```
+✘ [ERROR] Could not resolve "npm:lit@^2.2.7"
+
+ node_modules/@jsr/datasette__table/datasette-table.js:1:36:
+ 1 │ import {LitElement, html, css} from 'npm:lit@^2.2.7';
+ ╵ ~~~~~~~~~~~~~~~~
+
+ You can mark the path "npm:lit@^2.2.7" as external to exclude it from the bundle, which will
+ remove this error and leave the unresolved path in the bundle.
+
+1 error
+```
+And at this point... I gave up. I'm going to publish this TIL and see if anyone can get me unblocked!