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Make errors and their messages more accurate and helpful (#2536)

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Also, I normalized them to all be sentences for consistency, and I moved
the reentrancy check from `m.mount` to `m.render` to be a little more
helpful. The router change during mounting is inconsequential and only
to avoid the new modified error, and the change to the update loop is to
send the original error if an error occurred while initializing the
default route. (This is all around more useful anyways.)

And while I was at it, I fixed an obscure bug with sync redraws.
This commit is contained in:
Isiah Meadows 2019-09-30 16:08:04 -04:00 • committed by GitHub
parent 475747800a
commit b98ab29efd
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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 310 additions and 54 deletions
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15
api/mount-redraw.js
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@ -4,17 +4,15 @@ var Vnode = require("../render/vnode")
module.exports = function(render, schedule, console) {
var subscriptions = []
var rendering = false
var pending = false
var offset = -1
function sync() {
if (rendering) throw new Error("Nested m.redraw.sync() call")
rendering = true
for (var i = 0; i < subscriptions.length; i += 2) {
try { render(subscriptions[i], Vnode(subscriptions[i + 1]), redraw) }
for (offset = 0; offset < subscriptions.length; offset += 2) {
try { render(subscriptions[offset], Vnode(subscriptions[offset + 1]), redraw) }
catch (e) { console.error(e) }
}
rendering = false
offset = -1
}
function redraw() {
@ -31,13 +29,14 @@ module.exports = function(render, schedule, console) {
function mount(root, component) {
if (component != null && component.view == null && typeof component !== "function") {
throw new TypeError("m.mount(element, component) expects a component, not a vnode")
throw new TypeError("m.mount expects a component, not a vnode.")
}
var index = subscriptions.indexOf(root)
if (index >= 0) {
subscriptions.splice(index, 2)
render(root, [], redraw)
if (index <= offset) offset -= 2
render(root, [])
}
if (component != null) {