hardfist

does this url have some form doc description ? how do i mapping an library name to this url

does it supports custom format, i want the bundle version to be commonjs format

since no spec about tree shaking, I don't know which is right

seems same as https://github.com/evanw/esbuild/issues/1694

yes，i think support multi tsconfig is kind of odd and complex，it would be better if we can configure compiler options only by option or root tsconfig

@evanw It would be very convenient if load can return sourcemap with contents(even thou user can embed sourcemap into content themselves)

宿主不设置z-index值，那么默认值为auto，根据规范[分层显示](http://w3help.org/zh-cn/kb/013/)可得 1.若宿主z-index:auto,宿主和body属于同一个层叠上下文，根据分层图可得，before元素属于2.层叠级别为负值的后代层叠上下文而body的背景属于3常规流内非定位子元素组成的层，所以3在2的前面 2.若宿主z-index不为auto，宿主和body不属于同一个层叠上下文，before在宿主所处的层叠上下文里，而宿主的z-index为0或正值时属于层级6和7在3之前所以可见，但假如z-index为负值则又在3之后，又不可见了。

@youngwind 目录那里还是写成了赛贝尔曲线

`currentModule.rawRequest` maybe `undefined` which makes manifest containes a `undefiend` key, which seems doesn't make sense.

> Yes, it is expected for externals `@import`, because when you concat multiple files some of them can havean an external `@import` at top and we want to support it...