Add rollup instructions #15
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Using rollup as a project bundler introduces two problems with pdfmake: 1. rollup won't allow for reassigning imported module (see rollup/rollup#436), so there is no way to assign vfs fonts manually. 2. rollup won't parse vfs_fonts.js, since it uses `this` at top level, with is by default set by rollup to `undefined` (see https://rollupjs.org/guide/en/#error-this-is-undefined) To resolve both issues, `this` for pdfmake needs to be set to `window`, with `options.moduleContext` in rollup config, and then fonts assignments needs to happen before importing pdfmake to rollup scope (fortunately, since `this` in vfs_fonts is now `window`, it will do the assignment automatically).
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Using rollup as a project bundler introduces two problems with pdfmake:
thisat top level, with is by default set by rollup toundefined(see docs)To resolve both issues,
thisfor pdfmake needs to be set towindow, withoptions.moduleContextin rollup config, and then fonts assignments needs to happen before importing pdfmake to rollup scope (fortunately, sincethisin vfs_fonts is nowwindow, it will do the assignment automatically).