[Flight] Don't use object property initializer for async iterable

[sebmarkbage]

It turns out this was being compiled to a _defineProperty helper by Babel or Closure. We're supposed to have it error the build when we use features like this that might get compiled.

We should stick to simple ES5 features.

[react-sizebot]

Comparing: 6c7b1a1...010f1e2

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	530.57 kB	530.57 kB	=	93.67 kB	93.67 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	651.66 kB	651.66 kB	=	114.78 kB	114.78 kB
facebook-www/ReactDOM-prod.classic.js	=	674.81 kB	674.81 kB	=	118.78 kB	118.78 kB
facebook-www/ReactDOM-prod.modern.js	=	665.30 kB	665.30 kB	=	117.19 kB	117.19 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.unbundled.production.js	=	62.16 kB	62.03 kB	=	12.47 kB	12.45 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.unbundled.production.js	=	62.16 kB	62.03 kB	=	12.47 kB	12.45 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js	=	60.56 kB	60.44 kB	=	12.31 kB	12.29 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js	=	60.02 kB	59.89 kB	=	12.22 kB	12.20 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.production.js	=	60.02 kB	59.89 kB	=	12.22 kB	12.20 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js	=	59.86 kB	59.73 kB	=	12.22 kB	12.20 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js	=	59.77 kB	59.65 kB	=	12.19 kB	12.17 kB
oss-experimental/react-client/cjs/react-client-flight.production.js	=	58.61 kB	58.49 kB	=	10.90 kB	10.88 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js	=	59.31 kB	59.19 kB	=	12.13 kB	12.11 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.production.js	=	59.31 kB	59.19 kB	=	12.13 kB	12.11 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js	=	59.23 kB	59.10 kB	=	12.11 kB	12.09 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.production.js	=	59.23 kB	59.10 kB	=	12.11 kB	12.09 kB
oss-stable/react-client/cjs/react-client-flight.production.js	=	58.16 kB	58.03 kB	=	10.83 kB	10.81 kB
oss-stable-semver/react-client/cjs/react-client-flight.production.js	=	58.13 kB	58.01 kB	=	10.81 kB	10.79 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js	=	57.41 kB	57.28 kB	=	11.69 kB	11.67 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js	=	56.86 kB	56.74 kB	=	11.60 kB	11.58 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.production.js	=	56.86 kB	56.74 kB	=	11.60 kB	11.58 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js	=	56.74 kB	56.62 kB	=	11.60 kB	11.58 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js	=	56.20 kB	56.07 kB	=	11.52 kB	11.50 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.production.js	=	56.20 kB	56.07 kB	=	11.52 kB	11.50 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js	=	55.95 kB	55.82 kB	=	11.42 kB	11.39 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js	=	55.40 kB	55.28 kB	=	11.33 kB	11.30 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.node.production.js	=	55.40 kB	55.28 kB	=	11.33 kB	11.30 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js	=	53.85 kB	53.73 kB	=	10.98 kB	10.96 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js	=	53.42 kB	53.29 kB	=	10.88 kB	10.85 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js	=	53.31 kB	53.18 kB	=	10.89 kB	10.86 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.production.js	=	53.31 kB	53.18 kB	=	10.89 kB	10.86 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js	=	52.87 kB	52.75 kB	=	10.79 kB	10.76 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.production.js	=	52.87 kB	52.75 kB	=	10.79 kB	10.76 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js	=	51.51 kB	51.38 kB	=	10.48 kB	10.46 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js	=	51.29 kB	51.17 kB	=	10.38 kB	10.35 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js	=	50.96 kB	50.84 kB	=	10.39 kB	10.37 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.production.js	=	50.96 kB	50.84 kB	=	10.39 kB	10.37 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js	=	50.75 kB	50.62 kB	=	10.28 kB	10.26 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.production.js	=	50.75 kB	50.62 kB	=	10.28 kB	10.26 kB
oss-experimental/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js	=	154.30 kB	153.60 kB	=	36.03 kB	35.75 kB
oss-stable/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js	=	137.11 kB	136.40 kB	=	32.23 kB	31.95 kB
oss-stable-semver/react-server-dom-esm/esm/react-server-dom-esm-client.browser.development.js	=	137.08 kB	136.38 kB	=	32.20 kB	31.92 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js	=	129.89 kB	129.19 kB	=	23.98 kB	23.77 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.unbundled.development.js	=	128.56 kB	127.86 kB	=	23.72 kB	23.52 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js	=	126.21 kB	125.51 kB	=	23.48 kB	23.27 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js	=	125.23 kB	124.53 kB	=	23.39 kB	23.18 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js	=	125.14 kB	124.44 kB	=	23.35 kB	23.14 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js	=	123.28 kB	122.58 kB	=	22.98 kB	22.78 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js	=	122.04 kB	121.34 kB	=	22.85 kB	22.65 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js	=	120.75 kB	120.05 kB	=	22.50 kB	22.30 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js	=	118.90 kB	118.20 kB	=	22.25 kB	22.04 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js	=	118.34 kB	117.64 kB	=	22.11 kB	21.89 kB
oss-experimental/react-client/cjs/react-client-flight.development.js	=	117.81 kB	117.10 kB	=	21.48 kB	21.27 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js	=	116.51 kB	115.81 kB	=	21.64 kB	21.44 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js	=	116.16 kB	115.46 kB	=	21.72 kB	21.51 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js	=	112.41 kB	111.71 kB	=	20.94 kB	20.72 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.development.js	=	112.41 kB	111.71 kB	=	20.94 kB	20.72 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.unbundled.development.js	=	111.08 kB	110.37 kB	=	20.68 kB	20.47 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.node.unbundled.development.js	=	111.08 kB	110.37 kB	=	20.68 kB	20.47 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js	=	108.72 kB	108.02 kB	=	20.45 kB	20.24 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.node.development.js	=	108.72 kB	108.02 kB	=	20.45 kB	20.24 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js	=	107.74 kB	107.04 kB	=	20.31 kB	20.10 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.edge.development.js	=	107.74 kB	107.04 kB	=	20.31 kB	20.10 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js	=	107.65 kB	106.95 kB	=	20.28 kB	20.06 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.edge.development.js	=	107.65 kB	106.95 kB	=	20.28 kB	20.06 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js	=	105.80 kB	105.09 kB	=	19.95 kB	19.75 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.node.development.js	=	105.80 kB	105.09 kB	=	19.95 kB	19.75 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js	=	104.56 kB	103.85 kB	=	19.79 kB	19.59 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.edge.development.js	=	104.56 kB	103.85 kB	=	19.79 kB	19.59 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js	=	103.27 kB	102.57 kB	=	19.47 kB	19.28 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.node.development.js	=	103.27 kB	102.57 kB	=	19.47 kB	19.28 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js	=	101.40 kB	100.70 kB	=	19.24 kB	19.02 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js	=	101.35 kB	100.65 kB	=	19.22 kB	19.00 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js	=	100.84 kB	100.14 kB	=	19.10 kB	18.89 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-client.browser.development.js	=	100.79 kB	100.09 kB	=	19.08 kB	18.87 kB
oss-stable/react-client/cjs/react-client-flight.development.js	=	100.31 kB	99.61 kB	=	18.46 kB	18.26 kB
oss-stable-semver/react-client/cjs/react-client-flight.development.js	=	100.29 kB	99.59 kB	=	18.44 kB	18.23 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js	=	99.02 kB	98.31 kB	=	18.67 kB	18.47 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-client.browser.development.js	=	98.97 kB	98.26 kB	=	18.65 kB	18.45 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js	=	98.66 kB	97.96 kB	=	18.71 kB	18.50 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-client.browser.development.js	=	98.61 kB	97.91 kB	=	18.69 kB	18.48 kB

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