SVG download on notebook, but not with runtime?

I tried downloading and running a copy of Mike’s SVG download notebook, and found that the download buttons don’t work example on Github.

The console reports the following error:

10notebook-runtime.js?module:2 Uncaught TypeError: Failed to execute 'createObjectURL' on 'URL': No function was found that matched the signature provided.
    at HTMLAnchorElement.r.onclick (notebook-runtime.js?module:2)

Which in turn points to:

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"any" : n = +n, r.type = "range", r;}, select: function (e) {var t = document.createElement("select");return Array.prototype.forEach.call(e, function (e) {var n = document.createElement("option");n.value = n.textContent = e, t.appendChild(n);}), t;}, svg: function (e, t) {var n = document.createElementNS("http://www.w3.org/2000/svg", "svg");return n.setAttribute("viewBox", [0, 0, e, t]), n.setAttribute("width", e), n.setAttribute("height", t), n;}, text: function (e) {return document.createTextNode(e);}, uid: function (e) {return new K("O-" + (null == e ? 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Promise.resolve(e) : r ? (n || (n = new Promise((e, t) => (a = e, u = t))), n.then(() => e)) : Promise.reject();};}function st(e) {e._invalidate(), e._invalidate = He, e._pending();var t = e._value,n = ++e._version,r = null,o = e._promise = Promise.all(e._inputs.map(at)).then(function (o) {if (e._version === n) {for (var i = 0, a = o.length; i < a; ++i) switch (o[i]) {case nt:o[i] = r = ut(e);break;case rt:r || (r = ut(e)), o[i] = lt(r, e);}return e._definition.apply(t, o);}}).then(function (t) {return function (e) {return e && "function" == typeof e.next && "function" == typeof e.return;}(t) ? ((r || ut(e)).then((i = t, function () {i.return();})), function (e, t, n, r) {function o() {var n = new Promise(function (e) {e(r.next());}).then(function (r) {return r.done ? void 0 : Promise.resolve(r.value).then(function (r) {if (e._version === t) return ct(e, r, n).then(o), e._fulfilled(r), r;});});n.catch(function (r) {e._version === t && (ct(e, void 0, n), e._rejected(r));});}return new Promise(function (e) {e(r.next());}).then(function (e) {if (!e.done) return n.then(o), e.value;});}(e, n, o, t)) : t;var i;});o.then(function (t) {e._version === n && (e._value = t, e._fulfilled(t));}, function (t) {e._version === n && (e._value = void 0, e._rejected(t));});}function ct(e, t, n) {var r = e._module._runtime;return e._value = t, e._promise = n, e._outputs.forEach(r._updates.add, r._updates), r._compute();}Object.defineProperties(ot, { load: { value: function (e, t, n) {if ("function" == typeof t && (n = t, t = null), "function" != typeof n) throw new Error("invalid observer");null == t && (t = new Ae());const { modules: r, id: o } = e,i = new Map(),a = new ot(t),u = l(o);function l(e) {let t = i.get(e);return t || i.set(e, t = a.module()), t;}for (const e of r) {const t = l(e.id);let r = 0;for (const o of e.variables) o.from ? t.import(o.remote, o.name, l(o.from)) : t === u ? t.variable(n(o, r, e.variables)).define(o.name, o.inputs, o.value) : t.define(o.name, o.inputs, o.value), ++r;}return a;}, writable: !0, configurable: !0 } }), Object.defineProperties(ot.prototype, { _compute: { value: function () {return this._computing || (this._computing = this._computeSoon());}, writable: !0, configurable: !0 }, _computeSoon: { value: function () {var e = this;return new Promise(function (t) {requestAnimationFrame(function () {t(), e._computeNow();});});}, writable: !0, configurable: !0 }, _computeNow: { value: function () {var e,t,n = [];(e = new Set(this._dirty)).forEach(function (t) {t._inputs.forEach(e.add, e);const n = function (e) {if (e._observer !== Ve) return !0;var t = new Set(e._outputs);for (const e of t) {if (e._observer !== Ve) return !0;e._outputs.forEach(t.add, t);}return !1;}(t);n > t._reachable ? this._updates.add(t) : n < t._reachable && t._invalidate(), t._reachable = n;}, this), (e = new Set(this._updates)).forEach(function (t) {t._reachable ? (t._indegree = 0, t._outputs.forEach(e.add, e)) : (t._indegree = -1, e.delete(t));}), this._computing = null, this._updates.clear(), this._dirty.clear(), e.forEach(function (e) {e._outputs.forEach(it);}), e.forEach(function (e) {0 === e._indegree && n.push(e);});for (; t = n.pop();) st(t), t._outputs.forEach(r), e.delete(t);function r(e) {0 == --e._indegree && n.push(e);}e.forEach(function (e) {var t = new Te("circular definition");e._value = void 0, (e._promise = Promise.reject(t)).catch(He), e._rejected(t);});}, writable: !0, configurable: !0 }, module: { value: function () {return new et(this);}, writable: !0, configurable: !0 } });export { G as Inspector, Ae as Library, ot as Runtime, Te as RuntimeError };

Is this a bug? Or expected?

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Hmm, a quick workaround is to change the script import in the HTML file from:

import {Inspector, Runtime} from "https://unpkg.com/@observablehq/notebook-runtime@1?module";

to (edit: the following works, but is unsupported: see @mbostock’s post for the correct import statements!)

import {Inspector, Runtime} from "https://unpkg.com/@observablehq/runtime@3?module"

(For some reason the most recent version runtime@4 doesn’t work at the moment either due to some issue with marked?)

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Nice workaround! Thanks Bryan.

The reason runtime@4 is not loading is that you are using unpkg’s experimental support for ES modules, which we do not support for the Observable runtime. Instead, per the README, we provide a bundled ES module:

import {Runtime, Inspector} from "https://cdn.jsdelivr.net/npm/@observablehq/runtime@4/dist/runtime.js";

Or using unpkg:

import {Runtime, Inspector} from "https://unpkg.com/@observablehq/runtime@4/dist/runtime.js";

Unfortunately, we can’t specify this as the module entry point in the package.json without also changing how the source would be consumed by bundlers such as Rollup, and unpkg does not have a separate dedicated endpoint for the experimental ?module feature.

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