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Support captured reference to this in lambdas

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Lumi returns references to the `this` variable as
`.this`, so we need to rewrite these when emitting
into Lambdas.  In addition, the TypeScript compilation
of lambda functions requires that we create an environment
for executing the generated code where `this` has the
right value, which requires some subtle changes to our code
generation.
This commit is contained in:
Luke Hoban 2017-07-13 15:51:21 -07:00
parent 0b24ab7070
commit 61bcf1d704
1 changed files with 9 additions and 2 deletions
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11
lib/aws/pack/serverless/function.ts
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@ -105,6 +105,12 @@ function envObjToString(envObj: { [key: string]: string; }): string {
for (let i = 0; i < (<any>keys).length; i++) {
let key = keys[i];
let val = envObj[key];
// Lumi generates the special name `.this` for references to `this`.
// We will rewrite to the same `_this` and then pass that as the
// receiver to `.apply` later on.
if (key === ".this") {
key = "_this";
}
if (isStart) {
ret += " ";
} else {
@ -131,10 +137,11 @@ function createJavaScriptLambda(
let name = fkeys[i];
str +=
"function " + name + "() {\n" +
" var _this;\n" +
" with(" + envObjToString(funcs[name].env) + ") {\n" +
" return (() => {\n\n" +
" return (function() {\n\n" +
funcs[name].code + "\n" +
" })().apply(this, arguments);\n" +
" }).apply(_this).apply(undefined, arguments);\n" +
" }\n" +
"}\n" +
"\n";